I love this thread.
Best: At a rock concert, spotted the hottest girl in our department at work, picked her up by the waist (without asking, very risky in hindsight), lifted her up and put her on my shoulders, where she remained for about half an hour. Next day at work, she reported this to everyone who would listen, describing it as "the coolest thing that had ever happened" to her.
Worst: Losing my jacket, my phone, and what remained of my dignity, in a club a few weeks ago. Worse still due to my drunken state I went home wearing my friend's jacket, which was similar to mine, and then had to return it to him whilst still massively hung over. On the plus side I got my jacket and phone back because a girl who works at the club is my friend, saw what happened, and took them to hers for safe keeping.