I drove my van around a parking lot without a permit when I was 15.
I rode from Peoria, IL to Mahomet, IL without a seatbelt when I was 9 (didn't realize it until then)
I cracked through gamewinners.com to post a cheat when I was 11. Requirements were 13+
I've lied about my age in several sign ups around the internet, usually so I was over 13. Age is true here, though ;)
When I was 12 or so, I would go hopping through servers and falsely accuse people when Admins came online. Several got banned (none perma)
Idk about anything else bad though. I realize the last one isn't exactly illegal, but frowned upon. Never drank, no drugs, I don't speed, etc.