I was speaking with my new company's IT guy for the first time on the phone a while ago about some troubleshooting issue recently, and we were speaking for a good five minutes or so before he got hung up on a fairly severe stutter (several long seconds) for a lot of the rest of the conversation. But he ground through it like a champ, I didn't say a word about it, and we continued as if nothing had happened. Was interesting in retrospect that he was able to go so long without stuttering though. I stuttered heavily as a kid and now in my mid-30's rarely if at all.