Most embarrassing place you've gotten a boner?

Wouldn't call them embarrassing, more inopportune but a few memorable moments when the old boy decided to make his attention known - during class, sports at prep school (but it was an all-male school school so spontaneous boners were more the rule than the exception), in business meeting especially when the imagination wanders, at a dinner at the White House of all places
 
Probably in the classroom in college when I was 17, luckily even though they lasted the whole length of the class at times I was never caught.
 
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My best friend from my 20's would spend the night at my house several times a week. I was never embarrassed about sleeping naked around him even though his dick was bigger than mine and it was not unusual for one or both of us getting boners. He was totally straight with a girl friend and all but we were best friends and he didn't care if I was gay. (now days he won't even talk to me).

One night we were asleep and I woke up with him shoving me away from him. Apparently I had popped a boner and covered his ass with a ton of precum. He said he woke up feeling wet and reached down and my dick was rubbing his ass. He laughed about and took his briefs off so he would not sleep in them wet. The next morning I woke up first and noticed his dick was hard and beet red and there was a long stream of precum hanging from his dick. But there was more than just precum. It looked like he had shot a load during his sleep and his dick stayed hard afterwards. I guess he enjoyed what had happened last night. I pretended to go back to sleep so he would be able to clean himself up while I slept. A few minutes later I heard him stir and reach down for a cum rag I kept under the bed. Then he went and took a shower.
 
In communal high school PE and sports showers. Eventually I would learn to look at the walls, close my eyes, count backward from 100, etc.

At the urologist when I had a problem with my prostate. She slid her finger into my ass and moved it around far more than for just the usual exam, while her very cute assistant held a gauze pad against my cock to catch any cum. The assistant got a surprised smirky look on her face as I immediately became fully erect and cum started oozing out.

Any time I get a massage from a pretty massage therapist. One I used to go to noticed I was squirming a bit on my back under the towel. I had gotten erect and my urethra was uncomfortably pressing against the towel, which I told her when she asked what I was doing. Shockingly she just pulled open the towel and finished the massage with my cock standing up straight at full attention. No way was it going down then, knowing that she was seeing it. Later she said, “You might want to have your wife take care of that when you get home!”
 
My best friend from my 20's would spend the night at my house several times a week. I was never embarrassed about sleeping naked around him even though his dick was bigger than mine and it was not unusual for one or both of us getting boners. He was totally straight with a girl friend and all but we were best friends and he didn't care if I was gay. (now days he won't even talk to me).

One night we were asleep and I woke up with him shoving me away from him. Apparently I had popped a boner and covered his ass with a ton of precum. He said he woke up feeling wet and reached down and my dick was rubbing his ass. He laughed about and took his briefs off so he would not sleep in them wet. The next morning I woke up first and noticed his dick was hard and beet red and there was a long stream of precum hanging from his dick. But there was more than just precum. It looked like he had shot a load during his sleep and his dick stayed hard afterwards. I guess he enjoyed what had happened last night. I pretended to go back to sleep so he would be able to clean himself up while I slept. A few minutes later I heard him stir and reach down for a cum rag I kept under the bed. Then he went and took a shower.
Sounds like one of the sleepovers I had
 
When my wife-to-be and I were dating and she would invite her girlfriends over to where it was her, me, and three of her closest friends with two having close to as big tits as my wife-to-be did. One of her friends, if I sat down in my recliner, and they were all in the kitchen, would make it a point to come in and sit down beside me in the recliner to where there really wasn't enough room. When she would get up, she would prop herself up getting up pressing on my boner and she would say, oh sorry when I knew it was on purpose. I'd tell my WTB and she'd say I was making something when there wasn't anything there. She finally saw this one boobing me and put 2 and 2 together and I thought I'd have to breakup a catfight. Really let it go for a while but didn't want my WTB to hurt her friends, her being into marshall arts heavy back then.
 
grappling with a female friend, who is a lesbian. who I think of as a friend and am not attracted to. it was so weird because not only am I not into her in that way, but I had been grappling for years at the time and it had NEVER happend before or since but RIGHT THEN it had to happen.
I don't think she had any idea thanks to how baggy grappling gis are but she sure gave me some strange looks when I kept blocking her from getting into my guard and forcing her to be in better positions lol
 
I went to a school where we had daily chapel. So combine boxers, chinos, and hormones. One day I had my knees on the back of the chair in front of me and per usual feel asleep. Wake up to a few snickers from my buddies sitting next to me as I popped a very obviously visible boner. At the time I was mortified. Now I laugh at it. Same thing sadly happened again the following semester only in bible class.
 
I’ve had a few, but probably the most embarrassing was a few years ago while on a business trip with two of my supposedly straight colleagues. We were all staying at the same hotel (separate rooms) and decided after we got back from the work dinner with the client to all hit the hotel gym together for an evening workout. We had the place to ourselves and it turned out that there was a sauna in the men’s locker room. After our workout we decided to use the sauna and sit and talk about the next days presentation. Because it was late in the evening, the batch of fresh towels had not arrived and there were only a few clean towels to be found and we needed them for our post workout shower, so we decided to just go into the sauna naked and each sit on a clean washcloth again, saving the full sized towels to dry off after our shower. Well sitting there in the heat, post workout blood flow at maximum, I watched as all three of our cocks started to plump up a bit. The only thing was, my two colleagues stayed at a healthy semi, hanging down between their legs as we sat and talked, but mine continued to rise. Within a minute or two I was at full erection pointing straight up. At first they didn’t say anything about it, but it was hard to ignore and Matt made a comment. I just said that I’d not cum in a few days and that the heat must be making it hard. Thankfully no other guests entered. It finally subsided to a semi and we finished and showered and went to our separate rooms. Well about ten minutes later, there was a knock on my door and it was Matt saying he wanted to go over something for the next days meeting. He mentioned that he also had not cum in a few days. Needless to say, we jerked off and sucked each other on the hotel bed.
 
I took speech class in college, gave a speech one day with a huge chub. about 1/2 way thru I saw the really good looking gal in class checking out my bulge. a quick glance and I knew she wasn't alone. I lost my whole train of thought for a little bit.