This goes on quite a bit and have seen it a few times myself over the years.
Once a waitress sprayed a bit of bench cleaner into a guys drink and i saw a guy spit on a hamburger at a certain hamburger chain.
I will not even tell u what one guy did to a pizza topping once as it was sick. ( but must admit it seemed funny to me at the time but i was not the one eating the pizza i suppose.)
