Where does this creepy laugh clip come from?

Specifically, this wav, which I’ve had for a few years, inherited from my old online MST-ing group. A particular favorite of mine, but I don’t know the source.

It would have come from a movie (probably, but not necessarily a “bad” one), and is named “mumylaff,” which might mean it was from a Mummy movie, or possibly was a guy named Mumy laughing, but I don’t know for sure.

That’s all I got…can anyone help?

Maybe it’s Billy Mumy laughing.

It’s from an old horror movie, but I can’t recall which one. Or maybe it’s a stock “I’ve gone insane” laugh track inserted into horror movies.

I think it’s Bramwell Fletcher losing it when he sees Karloff at the beginning of The Mummy, but youtube doesn’t seem to have a clip to confirm.

Sounds a lot like Gene Wilder’s Dr Frankenstein.

Yep I think this is it.

Starts at 2:31.

Damn, I was betting on it being Nicholas Cage

Awesome—thank you!