A joke, a god and a dog

–Hey Hal?

–I'm going to propose that I tell you a joke, Boo, on the condition that afterward you shush and let me sleep.

–Is it a good one?

–Mario, what do you get when you cross an insomniac, an unwilling agnostic, and a dyslexic.

–I give.

–You get somebody who stays up all night torturing himself mentally over the question of whether or not there's a dog.

–That's a good one!

David Foster Wallace

Infinite Jest