How many blondes does it take to screw in a lightbulb?
5
4 to turn the table, and 1 to hold the bulb.
Listen here, you dingus. This joke is about how people stereotype blonde to be dumb. The joke plays on the idea that it would take five blondes to screw in a light bulb because they are too silly to do it by themselves and need to do weird things like turning the table instead of simply turning the light bulb.