A bios or cmos jumper

"Jumper Parking" is when you have a Jumper hanging on one pin for safe keeping, rather than using it to turn a Jumper Setting on.

Find directions for a jumper and knit a blue jumper. If you are skills you could knit the Ravenclaw symbol onto the jumper otherwise you can buy the badges and sew them onto the jumper.

Applied physics! The jumper uses muscles to generate energy. This energy is used to overcome gravity, and the when gravity returns the jumper to the tramp, the tramp "catches" the jumper. In catching the jumper, the tramp stores the jumper's energy in its springs, and then returns it to the jumper. Simple and easy.

A grasshoper is a great jumper