About a year ago and friend of mine got a bad cut on his hand from some broken glass and he said he would put some salt on it for 5 bucks. Conveniently I had 5 bucks and a hankering to watch a teenager scream like a girl. The only thing he asked is that we had a bottle of water to wash it out if it got too bad. Longoing story short the "water" bottle was filled with peroxide and I'm sure you can all guess what happened when he decided to wash out the salt.
What's the best/worst prank you've seen, pulled, or been victim of?