rkynick, you're taking it too far.
How do you know all of those pictures you see in the newspaper aren't shooped? How do you know your mom is not lying to you? How do you know that Blockland was made by Badspot and he didn't steal it off of some bum? How do you know that Bill Gates is actually alive?
Whoever doesn't get the four: Count to 4 in binary on your fingers.
How do I count a 0 using my fingers?