Two strangers are sitting in an adjacent seats in airplane. One guy says to the other, "Let's talk. I hear that the flight will go faster if you strike up a conversation with your fellow passenger."
The other guy, who had just opened a good book, closes it slowly, takes off his glasses and asks, "What would you like to discuss?"©JOKEDEMO.COM

The first guy says, "Oh, I don't know; how about Nuclear Power?"©JOKEDEMO.COM

The other guy says, "OK, that could make for some pretty interesting conversation. But let me ask you a question first: A horse, a cow, and a deer all eat the same stuff, but the deer excretes pellets; the cow, big patties; and the horse, clumps of dried grass. Why is that?"©JOKEDEMO.COM

The first guy says, "I don't know."©JOKEDEMO.COM

The other guy says, "Oh? Well then, do you really think you're qualified to discuss Nuclear Power when you don't know crap?!?"