TaskSwitchXP Pro 1.1 alpha contains a funny easter egg in the about box of its configuration tool. If you wait long enough for all the credits to show up and disappear again, you’ll see a c: prompt on which magically the most feared command of all time appears “format c:” The security question is answered with “YES” and then the formatting starts.
Of course nothing really happens, but somehow one takes a deep breath and at first thinks “Shit! That can’t be real”. Then the brain starts to work and recognizes this as a very rude but afterwards funny joke.