Mizrahi's Law

An empirical law which states that any individual unused to seeing large domesticated farm animals will feel an almost uncontrollable urge to point them out to everyone in earshot when he or she encounters said animals, typically without any accompanying information.

Family driving on an interstate highway on a long road trip
Little Billy sees a cow grazing in a field off the side of the road
Billy: "Cow."

Everyone else, nodding in agreement: "Cow."

Dad: "There's Mizrahi's Law at work yet again!"