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• How many bassists -- does it take to screw in a light bulb?
  Just one, but the guitarist has to show him fi...
• How many bassists -- does it take to screw in a light bulb?
  It doesn't matter. Nobody will notice anyway....
• How many mathematicians -- does it take to screw in a light bulb?
  None. It's left to the reader as an exercise....
• How many libertarians -- does it take to screw in a light bulb?
  None, if he wants to sit in the dark, it's his business....
• How many thought police -- does it take to screw in a light bulb?
  None. There never was any light bulb....
• How many feminists -- does it take to screw in a light bulb?
  None. It's not the light bulb that needs changing....
• How many Sun readers -- does it take to screw in a light bulb?
  None, but one is enough to screw up the joke....
• How many televangelists -- does it take to screw in a light bulb?
  None. They screw in hotel rooms....
• How many Essex Girls -- does it take to screw in a light bulb?
  None, they only screw in Cortina...