Just scanning back I thought I'd add the one I heard back in Juneat Edinburgh. A teacher taking her class around the zoo reaches the bottom of the carnivore walk and the Sumatran tigers. I'm sure most people who have visited Edinburgh will be familiar with the rough layout of these enclosures and will know that at the front are two "dens" in which the tigers can sleep, after all, which cat of any size doesn't like to curl up in a corner and sleep.
First howler (keep in mind that these kids would have been about 8 or 9 years old), "Look kids, a lion with stripes!"
The class then move from Tibor to Chandra. Chandra is the female, Tibor's sister in fact, and often sleeps in her den. I'm convinced it's where she feels safe. The teacher then comes out with, "Now that's why zoos are bad for animals, they spend all their time sleeping in small parts of the enclosure."
I walked quickly away, I wasn't in uniform at the time and correcting a teacher in front of her class probably wouldn't have been a good move anyway!