The restaurant business is absolutely brutal, especially for a small, mom-and-pop op. Just getting customers in the door to try the food you've spent months perfecting, instead of hitting up a chain, can be a huge challenge.
So it's no surprise that restaurants will come up with gimmicks to get hungry bellies to their tables. It never hurts to aim at the funny bone, and you have to wonder if anyone does that better than the El Arroyo in Austin, Texas.