Pull My Finger is a joke or prank regaring flatulence in which a mark is asked to pull the finger of the illusionist (or person playing the joke), who simultaneously flatulates so as to suggest a causal relationship between the pulling of the finger and the subsequent expulsion of gas. References in popular culture tend to treat "pull my finger" as a meme, saying the line but not showing the result, apparently on the assumption that the result is well known.