Dumb and Dumber were riding in a car.
Dumb: Look at the bunch of cows.
Dumber: Not "bunch", "herd".
Dumb: Heard of what?
Dumber: Herd of cows.
Dumb: Of course I've heard of cows!
Dumber: No, no - a cow HERD!
Dumb: What do I care what a cow heard? I got no secrets from a cow.