A few years ago, Adult Swim did these short bits called “Not For Air” which played during commercial breaks. They consist of real cartoon footage that are either edited or redubbed. Here is one of them.

I wish I could find the other one I’ve seen, where Fred Flintstone is arguing with Wilma.

UPDATE: I removed the part where I said that Fred complains about Pebbles smelling like dinosaur doo-doo because that was a mismatched memory. I was thinking of Harvey Birdman. But there IS a Flintstones “Not For Air” where it looks like they’re swearing at each other.