Again this one happened when I was 13/14 ish. On my way home from school was pushed into someone's front garden by 5 or so older kids. Tossed 'em 50p (all I had anyway) so I could get outta there.
Best part of this story though is just before I got home I came across a couple of other kids I knew. I told 'em what just happened and one of 'em started laughing. I just flipped, grabbed his head and slammed his face into my knee three times.
Felt better after that :D