How many doofuses does it take to screw in a lighbulb?
Three. One to hold the bulb and two to spin the chair.
How do you get a one-arm doofus out of a tree?
Wave to him.
What did the doofus name his zebra?
How do you sink a submarine full of doofuses?
Knoock on the door.
What do you do if a doofus throws a grenade at you?
Pull the pin and throw it back.