Knock knock… cows Posted on March 30, 2015March 30, 2007 by admin Person 1: Knock,Knock Person 2: Who’s there? Person 1: Cows go. Person 2: Cows go who? Person 1: No, silly! Cows go moo! Spread the love Related posts: Super Gran Camping En una ocasi�n en la The Punny Frog