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• Q:" How many Martians does it take to screw in a light bulb?
  "A:" One and a half. "A:" Two - but they are very tiny....
• How many dull people does it take to screw in a light bulb? One.
• How many gays does it take to screw in a light bulb?
  Two. One to screw the light bulb and one to grease the socket....
• Q:" How many Hinayana Buddhists does it take to screw in a light bulb?
  "A:" Two - One to screw in the light bulb, and one to not screw in the light bulb....
• How many Zen Buddhists does it take to screw in a light bulb?
  Two. One to screw in the light bulb, and one to not screw in the light bulb....
• Q:" How many Mahayana Buddhists does it take to screw in a light bulb?
  "A:" Four - One to screw in the light bulb, one to not screw in the light bulb, one to not not screw in the light bulb, and one to not do any of those....
• How many Mahayana Buddhists does it take to screw in a light bulb?
  Four. One to screw in the light bulb, one to not screw in the light bulb, one to not not screw in the light bulb, and one to not do any of these....
• How many economists does it take to screw in a light bulb?
  Two. One to assume the ladder, and one to change the light bulb....
• How many bluegrass musicians does it take to screw in a light bulb?
  Two. One to screw it in and one to complain that it's electrified....