Submarines.
A submarine
If you open the windows in a submarine, your problems will begin.
A. "Because sheep would be too obvious"
A crowbar.
By the stripes on his Adidas jumpsuit.
Mom: It's a private caller. Dad: Don't answer that. We only pick up for ranks Lieutenant Caller and higher.
For the chance to gain some experience in the service.
Nobody ever says "Thank you for your service" to the latter.