You take off their hats
Because every time he puts up a prayer it gets answered. (I thought of this myself, but it is so corny, it could easily be in every damn joke book.)
They've both put their faith in the cloud.
A magician makes rabbits appear in hats, while a psychologist makes habits appear in rats.
A: You go AHEAD I'll HANG AROUND!
Getting an elephant pregnant in a Volkswagen.
A **Volts**wagon