I have done my fair share of reasonably shocking/awesome stuff in my time although not much of it springs to mind. Two that do however are:
1. At an arcade a few years ago (I would have been 13 or 14 at the time I think) I was playing Tekken 4 for a while and rand out of credits so I started again. I only had one pound left and couldn't be bothered getting any more money so I just thought, screw this I'll roll with it. I was playing through arcade as Jin and realised after a while that I was doing quite well. I kept on winning and winning over and over and a crowd started to build up around me. I can't remember how it finished, either arcade mode ends after a certain amount of time or fights or something (it's different on the PS2 as far as I'm aware) but anyway by the time I'd finished, a rather large crowd had amassed and most of them looked on in awe as I walked away from the machine. I felt pretty awesome.
2. On my 16th birthday I went paintballing with some friends, there were a few other parties there all of which had someone in who was celebrating an event (birthdays, stag do's and the like) and so the marshall said that we were going to play a game called "The Stag Run". What the stag run entails is a stag (or in this case The Stags as there were a few of us) to run from one end of the paintball field, touch a flag and then run back whilst everybody else present fires at them with their guns. There were a fair few people firing at us, I'd say we were outnumbered maybe 10 to 1 and yet, whilst the other "Stags" got absolutely peppered, I was completely untouched.