I have one. I used to have two. Both FtM trans bois. I had to suggest another, more corporate route for one as that person had some serious substance abuse problems in the past, and Rock Concerts in San Francisco are not the best environment for that. But the other one, was nicknamed (and our nicknames last a lifetime in this biz) Crash on the very first show - Smashing Pumpkins - that they ever worked with me.
Through no real fault (but sort of) Crash moved a box, and in so doing dropped a moving light worth about $14K. Panicked beyond all level of life itself, the poor thing looks at me and asks what was to be done. (I'm sure, because I've talked to Crash about it since then, that it was going to be the end of the career). But I was not going to lose an apprentice, so I said, "we're going to put it back in the box and I want you to find some orange tape, put a big X on the top of it and write "NFG" on it" "What's that mean?" was the reply.
We had had a conversation about names, and Crash didn't like the female one they got stuck with at birth, so I - I do try to respect people once in a while - didn't use it, so I just said, "Crash, NFG means 'no f***ing good' and from that moment on Crash it was. And I told Crash that I would do my best to just forget it (largely because its Smashing Pumpkins and I have a deep and abiding hate of Billy Corgan so screw him....) but they better never ever forget that I forgot it.
We've been an awesome pair since then.