Hmm, most memorable... a lot of times is just grabbing and pawing over the clothes so this one sticks out. You know after a pro sporting event and everyone is trying to pile out of the stadium, the guy behind me first started cupping my butt, and when I didnt pull away (i sent a wink over my shoulder instead, older dude, scruffy unshaven face, thin and wirey) he reached around and put his hand down the front of my shorts, grabbing my crotch, his finger pushing my panties between my pussy lips. The crowd started moving again so it ended before more could happen, but definitely memorable and enjoyable.
I can see that being a scary situation, but super hot it turns you on.