Weirdest thing I've ever done. Most people don't like to ask me this question, for rather obvious reasons.
THE weirdest thing I've ever done is a toss up between a little "competition" I had with a friend (more on that later), and the time I put a can of beer in my friends microwave (and ran like hell).
What is the little "competition", you're now probably wondering. Well, the competition involved two digestive biscuits, two glasses of water, and the carpet. You have two people, each person has 1 digestive biscuit, and 1 glass of water. With these tools, you must try to completely work the biscuit into the carpet, so that you can actually no longer see it - you must do this using only your shoe-clad foot and the water. The person who treads the biscuit into the carpet first wins.
But what about the beer can? Well, after about 1 second in the microwave, bright flashes of arcing electricity were hitting the can, and it was gradually expanding. The power supply to the microwave, along with all it's capacitors, managed to last long enough without burning out, for the can to expand, then explode, with such a force that the microwave door actually came off its' hinges! All that was left was a very broken microwave door, and a microwave interior with bits of beer can impaled in the plastics, and coated in a thick layer of boiling beer.
Hilarious.