As long as we’re sharing jokes:
My personal favorites.
How many flies does it take to screw in a light bulb?
Only two, but you have to figure out how to get them in there.
How many Teamsters does it take to change a light bulb?
10. You got a PROBLEM with that?
How many Amish does it take to change a light bulb?
The Amish don’t have light bulbs. They bake pies.
For JohnLarrigan:
How many Irishmen does it take to change a light bulb?
Three. One to hold the bulb, and two to drink until the room spins.
For Esprix:
How many gays does it take to change a light bulb?
Four. One to change the bulb, and three to scream, “Faaabulous!”
For Techchick:
How many computer programmers does it take to change a light bulb?
None–that’s a hardware problem.
Anybody else? I will graciously extend the OP to include knock-knock jokes, a form of humor that I personally don’t get, but I am always happy to be enlightened.
P.S. No Dopers of any ethnic, sexual, or occupational groups were harmed during the making of this non-PC post.