So lots of us have pulled funny pranks (or had them pulled on us) throughout the years...so why not share them for others to laugh about? Post your funniest ones here and the thread can be a continuing one for new pranks as they get pulled. 
I'll start...my roommate and I put ads for a charity on our cars with window paint and my friends got ahold of it and proceeded to draw a few penises on them after dark, so to get them back we did two things:
1. Replaced all of one guy's boxers with [used] women's underwear purchased at Goodwill and the Salvation Army
2. Purchased a few magazines of fupa porn and covered the other guy's entire bedroom with it
I'm afraid of what they're going to do to get us back...
I'll start...my roommate and I put ads for a charity on our cars with window paint and my friends got ahold of it and proceeded to draw a few penises on them after dark, so to get them back we did two things:
1. Replaced all of one guy's boxers with [used] women's underwear purchased at Goodwill and the Salvation Army
2. Purchased a few magazines of fupa porn and covered the other guy's entire bedroom with it
I'm afraid of what they're going to do to get us back...