The yells come from the golden age of Warner Bros theatrical cartoons, where voice legend Mel Blanc built a library of screams, gulps and pain reactions for Looney Tunes and Merrie Melodies shorts. Those performances were reused for decades whenever a character was flattened or launched, becoming the template for cartoon pain sounds. Clips like this now circulate on soundboards alongside other staples such as Cartoon Chase and the Woody Woodpecker Laugh, kept alive by animators, editors and meme creators who need instant slapstick.