The reason we still don't have flying cars? Beer.

[Zkribbler]

An Irishman walks into a pub. He goes up to the publican and asks, "How tall is a penguin?"

"A penguin?? Geez, I don't know. Maybe about three feet."

"Holy Mother of God. I think I just ran over a nun."

[Lancer]

There'a almost no chance that he will write a paper to confirm that however.