Hasn't happened to me either and I have been involved in various box offices over the years and we have never done it.
Asking someone to help out in a genuine situation - fine
Asking someone to help out because you know you will be in that position through your own fault but turn up expecting someone to accommodate you - staggeringly entitled
It's indicative of an attitude of 'oh it's okay, someone will help'
You either accommodate them or you get accused of being miserable, mean spirited etc etc.
If someone asks me to move I'm either going to:
Do it and feel resentful
Refuse and risk getting a gobful of abuse
Due to MH issues, not know what to do, panic, get up, walk out and go home - jobs a good un because then the person can sit where they like.
Extreme reaction yes but that's what would happen.
I can't help that. I wouldn't have a go at the person asking but I would be furious.