Related:

• Do you know how many musicians it takes to change a lightbulb?
  No, big daddy, but hum a few bars and I'll fake it....
• How many psychologists -- does it take to change a light bulb?
  How many do you think it takes?...
• How many Scorpios -- does it take to change a light bulb?
  Why do you want to know? Are you a cop?...
• How many Heisenbergs -- does it take to change a light bulb?
  If you know the number, you don't know where the light bulb is....
• How many theoretical physicists -- does it take to change a light bulb?
  If you know how many, you can't know if they've done it yet....
• How many aerospace engineers -- does it take to change a light bulb?
  None. It doesn't take a rocket scientist, you know....
• How many Directors -- does it take to change a light bulb?
  What do you think? (Theatre humour)...
• How many paranoids -- does it take to change a light bulb?
  JUST EXACTLY DO YOU MEAN BY THAT? HUH? HUH?...
• How many Englishmen -- does it take to screw in a light bulb?
  What do you mean change it? It's a perfectly good bloody bulb!...