They play it at 30:07:

It's this demonic, evil laugh, and one I'm certain you've all heard before. I think it's really cool, but when I tried to find a sound byte, I came up empty handed. Yes, I tried going to stock sound effect websites, but instead of having the Hollywood stock sound effects that have been reused in countless movies and TV shows, they just host a bunch of sound effects created and donated by regular people. Does anyone know for a fact where I can find this laugh? Please post a link to the actual file as opposed to suggesting I sift through God knows how many files in websites that might not even have it. Also, where did this laugh originate from? What is it called?

Enjoy more sound effects that get reused for some reason!