Show us a great April Fools' Day joke.
Today's "Woot Off"....
The best practical joke I've ever been involved with was when I was working on Ultima Underworld. We put a special file on the head honcho's computer and checked for that file in the code. If we found the file, we would periodically, and for a very short time, swap the palette (this was in the days of 256 color games) to some hideous orange and purples. So every now and then, we hear yelps from his office to come quick and see what just happened! Of course, by the time we got there, the palette had swapped back and nothing could be traced.
I'm not sure if we ever let him onto the joke. The code for the check of MSDOS.SYS is probably still there!