Two strangers are on a plane when one says to the other, "Hey Buddy, let's talk. I was just reading in this Readers Digest that flights will go faster if you strike up a conversation with your fellow passenger..."

The other bloke, who had just opened a book closes it slowly, takes off his spectacles and asks, "So, what shall we discuss?"

"Well," says the first guy, "what about Nuclear Power?"

The other guy nods and says, "Fair Enough, I guess that would be a worthwhile conversation. But first, let me ask you a question: A horse, cow and elk all eat the same stuff - but the elk excretes pellets, the cow big patties and the horse, clumps of dried up grass. Why is that?"

The first guy shrugs and replies, "I don't know..."

"Well," says the other guy, "do you really think you're qualified to converse on Nuclear Power when you don't know shit?"