Well, it's not easy, but I start by being generally bad at almost all things.
Somebody who stays up all night torturing himself mentally over the question whether or not theres a dog.
Man: The thief was spending less than my wife. Police: Then why are you reporting it now Man: I think now the thief's wife has started using it!
To prove they can focus on two things at once.
Parrot says, "Africa."
Said Jane. "I thought elephants stayed on the ground!"
Someone who stays up all night wondering if there is a dog.
