i'll start with 1 of mine:

I was about 6 and I was trying to make a cup of tea (yep, what a 6ear old is doing near a kettle) i shall never know.

anyway, i made what i thought was tea (which was, at the time, water and paint in a cup)

walked in to the lounge to drink it, knocked the door, knocked over the shelf with the pretty vase on it- and the whole floor became a sea of water, paint, and broken glass.

very amusing now, but back then it wasn't- it was actually quite fritening.