This plastic toy rabbit has a small magnet enclosed inside, and the egg also contains a magnet. Bring the two close together and they will of course attract, and stick together. However there is a much more subtle effect that can be achieved.

Bring the rabbit close to the egg, but without touching it, and you can cause the egg to spin. It calls for some dexterous work with the rabbit to keep the two apart, but you can get the egg spinning really quite quickly.