I went to a zoo in China and people were throwing lit cigarettes at the monkeys.
As a kid in Atlanta they had to put the animals behind glass for similar reasons. In Atlanta, I remember one guy abruptly opening his umbrella right on the monkey cage glass (plexi or whatever) and it was scaring the **** out of the monkeys and everyone laughed and laughed.
That was they kept the famous gorilla Willie B. when I was a kid. For three decades he sat in there. He was called a n*gger more often than Kunta Kinte.