sharpened to fine points

Dennis has a nasty habit of resting one or both of his elbows on me, and they are sharp little pain implements! I usually make some sort of noise when he does this, and it never fails to make him laugh (bruising Mommy is high comedy). I saw him rubbing his elbows across my bedposts and also running them across his play sword. He leaned elbows on me a short time later, and when I yelped, he said "this time I sharpened my elbows first before I poked you with them, ha ha!". Ouch!