The '90's Addams Family cartoon series featured audio clips at the end of each show. In the first season it was always just a sound byte of Lurch (Jim Cummings) doing his famous slow, drawn-out groan. In season 2, it was changed to a random audio clip from that particular episode.
Yin Yang Yo! did this as well. They'd play a random audio clip from that particular show at the end of the opening title sequence.