The rude customer and the unobservant cashier.
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I work at a theme park "restaurant", one day this family walks in and the kids go and find a seat and the mum and dad walk up and order. As they're just ordering food that's pre-made and bottled drinks it doesn't take long to plate it all up and by the time the woman has paid the order is sitting on the counter on a couple of trays ready to go. The woman abruptly turns on her heels and walks away leaving the man to carry the trays one at a time to said table. When he walks off with the first tray I turn to one of my workmates and mutter "Damn that woman was so rude she could have carried one of trays!"
At this point my colleague gives me a disgusted look and says
! "She has no arms"