Device Jokes

What is the name of the device that the king uses to control the moat around his castle? A remoat control.
In the medieval ages, many knights had to travel throughout day and night. In order to increase their visibility in darkness, they invented a device known as the knightvision goggles.
I invented a device that can stop a snake in its tracks.
It's made of asphalt.
My friend has a cold storage device that will discuss philosophical issues. It's a deep freezer.