What sort of unreasonable things?
Demanding people break company policies and licensing laws for one. I've lost count of the amount of times people have kicked off because I've ID'd them or because they believe it's legal to give their child alcohol over 5 years old despite the law on licenced premises stating very different (16/17 yo rule)
Ask for something off menu and then complain when they can't have it because you don't carry the ingredients.
Complain and abuse staff when told no, we can't just squeeze you in because we're fully booked.
Kick off because they ordered the wrong thing and then decide that the waiting staff and kitchen should have been mind readers.
Demanded a change of meal/drink because they don't like what they've ordered, even when it comes as described, and don't think they need to pay for it.
Moving tables into larger groups than 6 and getting shitty when asked not to.
Refusing to follow one way systems.
Demanding service at the bar.
And all those customers have one thing in common - they got an apology for it, and sometimes some sort of 'compensation' !
Why on earth should anyone have to apologise for following the law? Or their company policies? Or for not being able to magic extra ingredients or space out of their arse?
None of these things apply to this OP of course, but you asked what unreasonable things and there's a few I've been on the recieving end of since July.
Why do people think it's ok to demand others break laws and put their jobs at risk because it suits them?