I've been working in fine dining restaurants for 20 years. Managing for 5. Had. I've seen all kinds of craziness in that time. My favorite was during the holidays last year.
We had a lady who enjoyed herself a little too much at her company Christmas dinner. She went to use the restroom, leaving her purse at the table. As she was walking back to her table after pissing she went back to the restroom because she thought she left her purse in the stall. The stall was then occupied by another guest, a very sweet regular guest in her 70's. Businesswoman bangs on the door and demands her purse back. Regular informs her there is no purse in the stall and that the restroom is occupied. The woman proceeds to kick the stall door in, grabs the old lady (with her panties still around her ankles) and throws her through the glazed glass bathroom door. Our regular ended up with approximately 6 inch glass shard in her ass. She grabbed the other woman and dragged her through the door with her, so the aggressor ended up with another shard in her neck.
Same night we had a party of around 20 guests. Their server managed to break a glass in her hand and had to go to the ER. The table was informed that their server had an accident and had to go to the hospital, and another server took over the table. They wrote a letter to corporate the next day saying they were discriminated against because of their race. Their specific complaints we're a delay in taking their order (due to a hospitalized server) and that we refused to let them use the women's restroom (due to broken glass and blood all over the room).