Otto Posted on June 21, 2017June 21, 2009 by admin Knock knock. Who’s there? Otto. Otto Who? Otto know. I can’t remember! Spread the love Related posts: Knock KnockWho’s there?Hiram!Hiram who?Hiram fine, Knock KnockWho’s there?Gina!Gina who!Gina you Knock Knock 80 Knock Knock 38