People who worked in Restaurants, what was the worst customer that you had to deal with?

I've only ever not given a regular tip once. I gave the moron a penny.

It was later at night. My server ignored me. He kept on being confused about what I was ordering, he was all weird and slurring his speech so not sure if he was drugged up or what the hell his deal was. Brought me the wrong food, twice. Brought me the wrong drink, then never came back again with what i wanted to drink. Paid the bill, left a penny tip, and wrote a very long note to Dennys corporate on their feedback thing. When I left I saw my server passed out behind the dennys and called 911. No idea what happened to him but that was the last time I've been to a dennys in years. Corporate sent me a gift card and an apology.

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