#3 Life sucks for you when the Slingshot Band Snaps
Getting hit with something from a slingshot sucks, Getting hit by the slingshot you are holding sucks even more.
#2 The Drunk Guy in The Slingshot
The moral of this one is not to pass out like a drunk idiot when your friends have access to a human launcher.
#1 Watermelon to the face.
During a challenge on The Amazing Race, contestants must launch watermelons from a giant sling shot contraption. This chick fails and the thing backfires sending the watermelon square into her face. LOL... you FAIL!