I’ve just discovered Crayon Physics. Remember playing with crayons as a kid and imagining your drawings coming to life?
Well, imagine no longer. This is an excellent example of why computers are so cool. I’ve known about this for maybe a day or so, and already I’m thinking of it in terms of some of the Great Games I’ve known: Zork, Flight Simulator, Oblivion, etc.
Don’t bother with the instructions; just let your inner kindergartener out to play with it and you’ll figure it out in no time.
Take a look — it’s really amazing.
EDIT: (No, this is not an April Fool’s joke.)