How do you do the If I'm a wombat are you a wombat joke?

Answer 1

Here is the way the joke works:

You and some (probably bored) friends are in a car, or a house, and you ask questions about various people or objects, asking if something about them makes them a wombat. The key is that unless you begin the question with a certain phrase (usually "listen" but it can be "okay" or "look"), the answer is "No, he/it is not a wombat." If the phrase is used, then "Yes, he/it is a wombat."

Variations include: "if this is a wombat, and this is a wombat" where the two things (or people) are similar in some way, then is a third thing/person a wombat? Again, it takes awhile before everyone catches on.