I never thought of myself as being particularly "well endowed" in the balls department until about two years ago when I had to go to the hospital emergency room -- long story that I won't go into. But, to make that long story short, they had to take off all my clothes in the emergency treatment area, and one of the nurses said to me (I was fully conscious) in apparent amazement, "You're all swollen down there," pointing down at my balls. I looked down and said, "No, I'm not!" She insisted that I was, and I insisted right back that that's how big they always are.
Later on, long after the emergency, I asked my general practicioner about it. "Hey, doc, I hope this doesn't sound too weird or anything, but are my balls unusually large?"
He said, very bluntly, "They're not abnormal or anything, but, yes, they are larger than average."
What makes this especially interesting is the fact that, about three years before that, my doctor and I agreed that I should start wearing jockstraps as everyday underwear on account of my growing "scrotal fatigue" (aching down there). He didn't tell me at that time that my balls were larger than average or anything; he just said that some guys experience "scrotal fatigue" as they get older. Now I guess I know why. Anyway, I wear jockstraps pretty much all the time now, and I rarely have scrotal fatigue anymore.
Learn somethin' new every day, eh?