Question: How many wizards does it take to screw in a lightbulb?

Answer: 6
A Slytherin to break the first lightbulb. A Ravenclaw to get a new one. Two Gryffindors to argue which one gets to put it in. A Hufflepuff to scream "WE'RE ALL GONNA DIE" and a Ravenclaw to put the lightbulb in.