People can be assholes at restaurants, expecting to be treated like kings on their nights out. Patient, saintly waiters and waitresses shared their stories on Reddit of the absolute worst customers they had to serve, who are even worse than the average hungry person.
They deserve all of the tips.
I used to work at TGIF as a bus boy and there was this huge group of about 20 people. At the end of their meal, they received the bill. Everyone put in money for what they ordered. They sat there for a while doing the math and finally figured it out. They call their waitress over and say "We ain't order no gratuity. Show me gratuity on this table." They continued to try and argue and made the waitress cry. Manager had to be called in to explain what gratuity was.