Trampoline Revenge

Pat hasn't been on the best of terms with his neighbor recently. So whenever Pat's two rambunctious children knock the ball over the fence into the neighbor's yard, it's not returned.
Last summer, Pat purchased a trampoline. When the neighbor saw Pat's children playing on the new trampoline, he remarked, "Now they'll probably be bouncing into my yard, too."
"That's all right," Pat responded. "You don't have to throw them back, either."