I know this thread is old, but I want to comment because I have one example that really made me actually cry... so I was at the Turtle Back Zoo a while ago, (of course I am there a lot but this scene was a while ago), and I was at the Gray Wolf Exhibit, one of my favirotes at the zoo. And this kid started banging on the glass and SCREAMING at the wolves. And I tried telling him to be quiet the wolves have sensitive hearing, BUT I WAS THE ONE GETTING YELLED AT BY HIS MOTHER. His mother goes "excuse me that's my child your talking to!" Like okay lady if you are aware that is your child then make your child be quiet for peeps sake. This is a zoo where you can't bang on the windows or scream at the animals. And so that day I left crying cause I was upset that she yelled at me but not her child who was the one causing disturbance to the animals.