Knock KnockWho’s there?Frederick!Frederick who?Frederick Express! Posted on January 1, 2016January 1, 2010 by admin Knock KnockWho’s there?Frederick!Frederick who?Frederick Express! Spread the love Related posts: Knock Knock 186 Knock KnockWho’s there?Lloyd!Lloyd who?Lloyd a Knock KnockWho’s there?Ketchup!Ketchup who?Ketchup the Knock KnockWho’s there?Boo!Boo who?Don’t cry