One of my co-workers won't eat vegetables, and try as I might, I can't rationalize his behavior.

The other day at lunch, he took issue with a mushroom bleeding over to his half of a pizza. One mushroom.

He's entitled to his taste palette; I just think it's wasteful to, for example, spend $8.66 on a plain cheeseburger. What's the harm in ingesting a little lettuce?