saw anything like that although I don't doubt it does happen in some cases, it is never appropriate. Only the lowest type of human life form would be ok with or participate in such a thing.
I wouldn't say it was likely, but I would say it is a possibility.
I wouldn't wish it on anyone.
I have worked in the tipping industry. I worked as a Valet for several years at a Vegas hotel. I know what it is like to be stiffed for my hard work or hear someone's lame excuse about why they don't have any money (why did you valet?) or how they will get you next time (maybe 1 in 10 actually do).
I'm just saying that spitting in someone's food is a criminal act and much worse than stiffing someone.