It is fun. The last time I saw it was with a frog doing exactly the same thing. The frog didn't miss a single ant, and in the end it jumped and bit the guy's finger for tricking him. Ok, maybe not for tricking him, but he got bit by the frog at the end of the video.
I think they can eat ants. I know they're omnivores and they're often fed protein-powdered (and living) crickets. But I'm not sure. I was watching a few videos about them but I don't know a lot. Oh, and I searched for the frog video and watched it, very funny. If anyone is wondering:
My favourite colour is green, my favourite number is 19.