Aristotle: It is the nature of chickens to cross roads.

Issac Newton: Chickens at rest tend to stay at rest, chickens in motion tend to cross roads.

Albert Einstein: Whether the chicken crossed the road or the road moved beneath the chicken depends on your frame of reference.

Werner Heisenberg: We are not sure which side of the road the chicken was on, but it was moving very fast.

Wolfgang Pauli: There already was a chicken on this side of the road.