"Duck Dodgers in the 24 and 1/2th Century" is a famous example of a Looney Tunes parody that outlived the relevance of the thing it was parodying (Buck Rogers in the 25th Century) but it's not even the only one.
The character of Foghorn Leghorn was a parody of Senator Claghorn, a character from the 1940s radio show The Fred Allen Show.
TV Tropes calls this the Weird Al effect, named for the number of kids who don't recognize certain older pop songs, but do their Weird Al parodies. Another very famous example is Cervantes's "Don Quixote", which is a parody of a genre of chivalric romances that no one but mediaevalists really read anymore.
























