Yesterday I was driving into town and passing one of the many farms I always pass. Many of the farms around here have free roaming chickens, and they are often right at the edge of the road, but never in the road, and never on the other side of the road and that's when I had the epiphany. "Why did the chicken cross the road?" is funny because chickens have a very strong natural tendency not to cross roads. So seeing a chicken on the other side of a road would be such a freakishly weird event that it would warrant humorous and quasi-philosophical speculation.