This was long time ago when I had recently learned about the nutritional differences between lettuces, how Romaine and Leaf Lettuces were good choices over Iceberg. I was at his house when I saw he had bought a head of Iceberg lettuce. I wanted to share my new knowledge.
ME: You have to eat the whole thing to get any nutritional value.
HIM: I am going to eat the whole thing.
Uncharacteristically I had nothing say to that. As far as comebacks go, I have to admit it was pretty good.