Knock knock cow Posted on September 25, 2015September 25, 2007 by admin a: knock knock? b: who’s there? a: interrupting cow. b: interrupting c… a: MOOOO! PS: make sure you say moo while “b” is speaking!! Spread the love Related posts: Knock Knock 38 Knock Knock 147 Knock KnockWho’s there?Valencia!Valencia who?Valenicia dollar, Madam Foot