<P> A lightbulb joke is a joke that asks how many people of a certain group are needed to change, replace, or screw in a light bulb . Generally, the punch line answer highlights a stereotype of the target group . There are numerous versions of the lightbulb joke satirizing a wide range of cultures, beliefs and occupations . </P> <P> Early versions of the joke, popular in the late 1960s and the 1970s, were used to insult the intelligence of people, especially Poles ("Polish jokes"). For instance: </P>

How many pollocks does it take to screw in a light bulb