I ran the drive thru for a fast food place for my first job. One day I was training my female coworker on the position. She had a customer at the speaker; he was in a minivan, with his wife and I think three kids.
Went something like this:
Dude: "Yeah, we'll take a #1 with a coke, #2 with a sprite, #1 with a diet coke, #4 with orange soda, and a #5 with a coke."
Coworker: OK, so, a #1 with a sprite, #2 with a coke, #1 with orange soda, #4 with diet, and a #5 with a coke.
Dude: "NO. I said a #1 with a coke, #2 with a sprite, #1 with a diet coke, #4 with orange soda, and a #5 with a coke."
Her: "Sorry, so a #1 with a sprite..."
Dude: "UGH LISTEN TO ME. A #1 with a Coke, #2 with a Sprite, a..."
I broke in: "Hey, buddy, you have five combos. You have two #1s, a #2, a #4, and a #5. You asked for two cokes, a diet, a sprite, and an orange soda. Did I get that right?"
Me: "OK, so does it really matter if the #1 comes with an orange soda or a coke, so long as you get all the drinks you wanted?"
Me: "NO, so lay off. It's her first day."
Dude: "Don't speak to me that way, we're going to <competitors restaurant>!"
Me: "My buddy runs that drive thru, tell him Optimaloutcome says hi!"