Can a bullet bounce...yes. Is it likely, no...especially something like a 9mm. But anything is possible.
I have actually treated a patient who was shot at contact range in the head with a .32 ACP, and the bullet went in and out the the same hole; that's a bounce. Bullets can clearly be deflected by a bone. As for "bounce", well I'd have to see what someone is calling a "bounce". I think its likely what Clint meant was deflect, and “bounce” is just a poor choice of words. Something you’d say in a very non-technical, anecdotal conversation while holding a beer.
