ive done some doozies in my time.. when i was 6 or 7, my sister who was younger, she broke a "hummel" figurine, she was crying and asked my what our parents would do, i said i didnt know, but then all of a sudden i said i had this memory of this other girl, who used to be my sister, and she broke one and after that she disappeared and i never saw her again, my sister cried and hid at the neighbors, i got in big trouble for that..
once at the bank i wrote on a deposit slip "i have a gun gimme all the money in your drawer" and slid the slip back into the stack..
i filled out a change of address card at the post office for an ex boss..
i super glued the lock of this guy who kept picking on a friend of mine at school so the dial wouldnt turn..
i did what someone else mentioned, about the musical greeting cards, i hid it in a classroom..
if i remember more i will mention them...