You just need to see this...

I don't know if you've ever seen it, but this is some random set of Super Mario levels that were made to be beatable, but only after more than likely thousands of attempts.  The guy's commentary is pretty funny.  I mean, it gets old after a while, but it is pretty funny.  Go ahead and check out the impossible levels at the following link:

http://www.youtube.com/watch?v=in6RZzdGki8