You may remember this from twenty years ago, but in methodology discussions back then, some would say that proper form sometimes means the disc hits your chest. Today, I'd say with great form, you never see that. But go look at some of the ads out there on you tube; In at least one of them Nate Doss hits his chest with the disc.
Every once in a while I will nick my left nip with the disc, fun times.
I can see Doss doing that too.