Guy walks into a psychiatrist's office, terribly distressed. He says, "Doc, "I keep having these alternating recurring dreams. First I'm a teepee, then I'm a wigwam, then I'm a teepee, and then I'm a wigwam. It's driving me crazy. What's wrong with me?"
The doctor ponders a moment or two, checks a medical journal, nods his head and says, "Just as I thought. Your problem, sir, is that you're two tents."
Also:
* What's Mary short for?
* Umm... She's got no legs?