Here's that Donkey Kong level mentioned in one of the comments threads. Jack and I came up with this when we were kids. It's a little bit of everything from the game...plus a few new surprises. Falling boulders, doors to jump through, unstable platforms, a super hammer that doesn't time out, a trampoline, and a cage that drops you into the oil barrel to burn...muaaah haa haa!

I'm working on recreating this bit of "hey wouldn't it be cool if..." with screenshots from the game. I'll post it soon.