Here's the video:
Apparently there's a whole genre based around large cats attacking kids through glass at the zoo. Which seems so ha-ha funny until the lions get out during some post-apocalyptic future and your kids think they are invulnerable to tigers or something.
When we lived in Asia, I had Z in one of those baby backpacks and we went to the local zoo, where the lion was held back from the visitors by a chain link fence. One day the lion looked right at Z and started roaring and then got into "pounce position." I didn't stick around to take pictures. We rapidly headed over to visit the monkeys.