a groaner
 
 A man went to his doctor's office and sat in front of
 his desk.  He began to rock back and forth, talking
 under his breath and saying, "I'm a wigwam -- I'm a
 teepee," over and over again.  The doctor listened
 carefully for a few minutes and then said "Its gonna
 be alright fella.  I know what's wrong with you."
 
 The guy looked up and said, "Can you help me, Doc?"
 
 The doctor said,  "Yeah -- you're not crazy. You're
 just two tents!"