Scholarly discussion

A stranger was seated next to Little Johnny on the plane when the thestranger turned to the Little Johnny and said, „Let’s talk. I’ve heardthat flights will go quicker if you strike up a conversation with yourfellow passenger.“Little Johnny, who had just opened his book, closed it slowly, and saidto the stranger „What would you like to discuss?““Oh, I don’t know,“ said the stranger. „How about nuclear power?““OK,“ said Little Johnny. „That could be an interesting topic. But letme ask you a question first. „A horse, a cow, and a deer all eatgrass. The same stuff. Yet a deer excretes little pellets, while a cowturns out a flat patty, and a horse produces clumps of dried grass. Whydo you suppose that is?““Jeez,“ said the stranger. „I have no idea.““Well, then,“ said Little Johnny, „How is it that you feel qualified todiscuss nuclear power when you don’t know sh*t?“