Three fonts walk into a bar...

Three fonts walk into a bar. The bartender looks up and says, "We don't serve your type in here."

Here is another example of a "walks into a bar joke". This one is a pun. A bartender (in western culture) sometimes says "we don't serve your kind here", or something like that to indicate that the person that just walked into the bar is not welcome (due to prejudice) and should leave. The pun is that fonts can also be called typefaces, so the word "type" is carrying two meanings.