The other day I was in my dorm room listening to some quiet music, when I heard a large crowd of people formed in the hallway. For some unknown reason, I grabbed an empty can of dr pepper ten, opened my door, hurled it into the hallway and yelled FRAG OUT! before slamming my door shut.
Stunned silence followed, then the whole group burst out laughing for quite a while I sat down and began listening to music again.
I have no idea why I did this, but I did, and now all throughout the building games of "grenade" are bursting out. It's a bit like tag, but it involves bursting into peoples rooms, yelling grenade and throwing a can before slamming the door.
List some silly things you've done.