I have been groped in public transit quite a few times.... And the most gross and scary experience was in a Mumbai local train. For those of you unaware, it probably world's most crowded and congested public transit system (just take a guess.. largest city in a country of 1.2 Billion). Being jam-packed, one get used to being touched in all the right places, in the awkward position, by the most weird body parts. So this one time, one guy in his mid 40s (I was in my late teens), came up stood in front of me with his creepy eyes staring right into my face. Then he slowly put his thighs (just above the knee) in between my legs. Being in a usual overflowing train, I didn't give it a second thought. But a minute or two later, he started moving his thigh up and down between my legs, around my groin. I looked at him, he smiled, I got furious and pushed him... but there was no place for him to get pushed into (people fight over a place to keep their foot in those trains)... So I covered by groin to avoid any further contact and the fear that with a push of crowd or jerk on train, he could as well knee my balls. And at the first opportunity, I moved far away from where I was standing, next thing I know.. he came behind me and stood next to me again.... I got freaked out and detrained on the next station... because the survival technique of Mumbai "you don't mess with strangers" or your body might never be found... so I hid in crowd (hoping he didn't coming chasing after me) and then took the next train....
But the rest of my groping experience were either fun or just another day type.. and I still don't mind being groped... but in a inconspicuous ways, by atleast a decent looking girl or guy.