Bent iPhone 5

Usually I put my phone down on it's back, but I put it down on its front one time and it rocked back and forward a little, I mean a tiny bit, but still noticeable. I made sure the desk was flat, I couldn't really believe it, so i put it on it's back and shined a light, and I could see it coming underneath the phone. Do you think apple would do anything about this?

(I can get pictures after school if anybody wants to see this.)