I had a few jobs not hire me, but it was the "We're not ever calling you back" kind of rejection.

I used to do voice acting on a site a while ago and auditioned for all these fan made projects. One time I got an email back about my auditions with the guy telling me "Listen, you suck at talking, I can't understand you and your accent (I have a slight speech impediment not an accent >.<) is terrible. You'll never get a (non-paying and fan done for fun, mind you) role in anything on this site". I had to laugh at the irony because I was involved in several projects at the time and the guy thought my unique sounding voice wouldn't land me a role ever, when in fact it did many times. XD