People are not happy unless they are angry. and when their angry they want to let everyone know it.
I worked in a burger King and still have nightmares!
Even when you do every thing right, and you smile, and tell them have a nice day they still yell at you.
The 2nd day before my last day this woman ordered a whopper meal. we would always hand them their drinks before they walk away. She just looked at me and didn't pick up her cup.
After a minute the other server handed her he food and she said. "That B*tch didn't give me my damn drink!"
Sometimes I wanted to just punch someone in the throat with a pair of brass knuckles!
And ya gotta smile no matter how much they piss you off.
Oh, and I had a woman order 35 double cheeseburgers in drive-thu.
"What the hell's taking so long?" After about 3 minutes!
"B*tch, what the hell you think is taking so long?! 35! Not 2 or 3 But 35!"