Weird sound coming from under pedals.

So I was just parked right next to a curb in a lot. It's a kind've awkwardly placed curb, so I completely forgot about it.

I backed up while turning sharply, and my front, driver side wheel ran into it.

Since then, I've been hearing and feeling a noise as if a ball is hitting a wall as I'm stopping. It's right underneath the driver side floor mat area.

I just took a look under the car, but saw nothing out of the norm.

Anybody have any idea what this could possibly be?