The Worst April Fool’s Prank of All Time

A four-year old kid goes into the bathroom with his brother. As his brother pees, the four-year old switches on a blow dryer. Then he turns and aims the hot air at his sibling’s stream of pee— and a rainstorm of urine is blown all over the place!

Not good.
Looking for more April Fool's pranks? Well... *blushes*... I DID write a book on this very topic! (Here's a few samples from the website of Boston radio station WODS.)