http://www.youtube.com/watch?v=JLraxB-9SsM

Spiralmike already posted one here but I wanted to do one of my own.

This video also shows what the entrance to the punkin king area looks like. I had actually entered a danger room on a previous run because I thought that it might be substituted in there, but it's actually a lot more obvious than that, and thankfully doesn't cost any energy. (I beat the danger room at least, so it wasn't a waste)