A joke on a joke.

"Guy asked me for a quarter for a cup of coffee. So I bit him." -- rupe, joke node.

A priest, a Rabbi, and a lawyer walk into a bar.
The barkeep sez "What is this, a joke?" -- Tem42, Two fish in a tank...

Also, many in Why did the chicken cross the road?.

(Metajoke? Sure I metajoke! I meta lotta jokes!)