Funny story about a student

I wasn't there for this, but I still think it's so awesome. Especially since the individual who said this is quite bright. But late one night a couple of the girls, who are roommates were up talking late one night and somehow "Soy Milk" came up. The one girl turned to the other, and in all seriousness said, "I've never really gotten Soy Milk, how do soy beans lactate?"