When someone grabs right above the knee with a bit of force and squeezes with 2 fingers, the other person feel they want to shake their lag or they will jump
Grandma gave grandpa a horsebite
When someone pinches just above the knee with 2 or more fingers which causes either a pleasant and enjoyable sensation or some may find it unpleasent.
John gave Jess a horsebite to see what would happen.