<P> Q. How many Polacks does it take to change a light bulb? A. Three--one to hold the light bulb and two to turn the ladder . </P> <P> Although lightbulb jokes tend to be derogatory in tone (e.g., "How many drummers ..." / "Four: one to hold the light bulb and three to drink until the room spins"), the people targeted by them may take pride in the stereotypes expressed and are often themselves the jokes' originators, as in "How many Germans does it take to change a lightbulb? One ." where the joke itself becomes a statement of ethnic pride . Lightbulb jokes applied to subgroups can be used to ease tensions between them . </P> <P> Some versions of the joke are puns on the words "change" or "screw": </P> <P> Q. How many psychiatrists does it take to change a light bulb? A. None--the light bulb will change when it's ready . </P>

Where does the light in a lightbulb come from