Because he is lying.
A person who stays up all night wondering whether or not there is a dog.
You: You can tuna piano but you can't piano a tuna! Person getting told joke: What about the jar of glue? You: I knew you'd get stuck there
Bed, bath and Beyond-ce.
An under cover cop.
You stop laughing and shoot him again.
One is living in a spaceship and one is living a lie.
Because the 'P' is silent
They believe in a single-pair system.