How many paranoids does it take to change a lightbulb?
Who wants to know?!?!
How many mystery writers does it take to screw in a lightbulb?
Two - one to screw it most of the way and the other to give it a surprise twist at the end.
How many kids with ADD does it take to change a lightbulb?
Let's go ride bikes!
Due to recent cutbacks...
The light at the end of the tunnel has been turned off till further notice!