You're listening to 20,000 Hertz.

In the film and TV industry, sound editors often use sound libraries to find the effects they need.

Many of these recordings go back decades, and certain sounds end up getting used over and over.

For instance, here's a recording you've probably heard called two cats angrily

yowling during catfight. These cat sounds have shown up in hundreds of movies and TV shows.

For instance, they're often used for the Simpsons cat, Snowball.

Well, I don't care what you say.

She still loves us more.

Don't you snowball?

These cat sounds apparently came from an early 80s recording of two real angry cats.

But some people think these sounds might have actually been performed by the legendary voice actor Frank Welker.

Here's Frank making cat noises on a variety show in the 1970s.

In fact, in some Simpsons episodes, Frank is specifically credited as the voice of Snowball

and the Simpsons' dog, Santa's Little Helper.

If that were a real girl scout, I'd have been bothered by now.

There's also a classic scream that you'll probably recognize.

The sound bite is called Man Let's Out Gut-Rinching Scream and Falls into the Distance.

That scream was recorded in the late 70s by an unknown voice artist. It was first used in a

1980 film called the Ninth Configuration. During a bar fight scene, a bad guy with a knife

lunges through a window.

In the mid-90s, the scream got a new burst of popularity thanks to an action movie called

Broken Arrow. In that movie, there's a character played by

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