1. Pretending your mechanical pencil was a syringe, and feeling like a total badass.
Why you'll never forgive yourself: Because you thought it was pretty cool that you could make such a believable ~optical illusion.~
2. Going into a chat room and exchanging your "A/S/L" with a total stranger.
3. Turning "invisible" on and off to make sure your crush heard the door slamming and opening on AIM.
Why you'll never forgive yourself: Because if he wasn't paying attention after your third sign-off, he was never going to pay attention.