Related:

• How can you tell when an elephant is getting ready to charge? He asks if you accept Visa.
• Q: How can you tell when an elephant's got her period?
  A: There's a quarter on your bedstand, and your pillow is missing....
• How can you tell if an elephant is in the same dark room with you?
  You can smell the peanuts on his breath....
• How can you tell the difference between a grape and an elephant if you're color blind?
  Dance on it for a while. If you don't get any wine, it's an elephant....
• How can you tell if an elephant is having an affair with your wife?
  You will have to wait 22 months....
• Q: How do you know when there is an elephant in the bath with you?
  A: You can smell the peanuts on his breath....
• How can you tell if a fence is electrified? Throw a puppy at it and see if he gets fried.
• What's big, grey, and proves the uncountability of the reals?
  Cantor's Diagonal Elephant! How can you tell that Harvard was layed out by a mathematician?...
• Q: How can you tell if your girlfriend's frigid? A: When you open her legs the lights go on.