How do you respond to coach who is right but an a** about it?

[MN BB Ref]

We all kick a call once in awhile...unlike coaches. I had a situation about a month ago in a boys varsity game that ended up going to double OT (I know, my partner and I screwed up not only once, but twice ). Anyway, with about 2 minutes left in regulation, Team A was in the bonus and shooting a 1 and 1. I was administering the FT and when I entered the lane I told the players that it was two shots. For whatever reason my partner did not catch my mistake. Needless to say, the shooter missed the front end of the one and one and the ball was caught be a Team B player who then promptly handed it to me out of bounds. Immediately the Team B coach realizes the mistake and starts to scream that it was a one and one. I know how we handled the situation, but I would be interested in how you would do it.

Even though the game went to 2OT it was some of the most fun I've ever had in a game. I would definitely take a few more like this every year.