Well, I thought I would add to this one since I have a good April Fool's joke went bad.
My dad is 65 yrs old and we all where at my parents house on April Fool's Day. My sister Sunshine was in the other room, when I got the bright Idea to put that fake blood on my dad's back leg.. he has Hemophilia So, I was trying not to laugh and ran out yelling Dad's bleeding and it won't stop! Then he walks out behind me acting hurt.Before we could say April Fools... My sister started crying uncontrollably and saying "Oh Dad somebody called 911 hurry!" We couldn't get her to stop crying. Let me tell you I was laughing so hard I was cry too. But then I felt so bad because we didn't quite think it through. Needless to say she left the house after she knew it was a joke and didn't talk to us again for a week. Bad sister award I know...
What was the worst thing you've done in the name of revenge?