These two guys are hanging out when one starts to tell his buddy a really bad joke. The first guy finishes telling the joke, completely ruining the punchline in the process, and his buddy cocks his eyebrow and says, "That's an Egyptian joke". The first guy looks quizzically at his buddy and says, "What do you mean, an Egyptian joke?". His buddy just looks at him and says, "Yeah. It Sphinx."
Get it? lol