Fantastic, all of them.
The only experience I can remember seems pretty tame compared to most of these, although possibly a lesson in how not to offer to buy someone a drink.
I was at a nightclub with a few people from school. This place never asked for ID, so it was the only nightclub to go to for those too disorganised/chicken to get a fake ID (I only ever went to nightclubs underage - it seemed kinda pointless once I was old enough to go legally).
Anyways, it was a somewhat atypical nightclub, given that most of the patrons were probably in their 30s instead of the usual teenage/early 20s demographic. Picture me, socially inept geek, standing awkwardly with people from school I didn't really know, near the bar.
Drunk guy in his 30s or 40s (not sure, I suck at picking ages even now): "Can I buy you a drink?"
Me (slightly panicking, due to a) complete social cluelessness and b) fear of being caught underage in a nightclub): "Uh, no thanks."
Him: "Oh, go on. What do you want to drink?" (leaning closer, somewhat uncoordinatedly due to extreme drunkeness)
Me: "Um, I can't actually drink, I'm still at school" (totally awesome effort at keeping the illegal underagedness in a nightclub a secret. Not.)
Him: "Well, what about a soft drink then?" (leaning ever closer)
Me: "Uh, no thanks. I don't like soft drink."
Him: "Well, can I get you a glass of water?" (still leaning closer)
Me: "Uh, no." (feeling like an absolute twit for saying no to a glass of water, then I think I beat a hasty retreat to the ladies bathroom, and spent the rest of the evening trying to dodge the guy).
Edit: The age of consent where I live is 16, so this isn't quite as bad as it sounds.