There was a long-running joke on campus that "Professor Dull is anything but".

Many of the long-running jokes on the show are pre-written or developed through improvisation.

The Finland episode came as the culmination of a long-running joke on the show.

Both figures had formed the basis of long-running jokes throughout the series.

Paul and Mike had immediately turned it into an assassination attempt and a long-running joke.

This was the start of the long-running jokes on Match Game about his hair.

There are long-running jokes about addiction to the computer.

The stage version, on the other hand, turns the same plot into what is essentially a long-running dirty joke.

There's a long-running joke that people use about not cleaning windows.

One of the long-running jokes of the show was the town bridge.