Random Knock Knock Joke on Engadget October 12, 2007 Leave a comment I went looking for more info on whether I should & could get an iPhone or not to use with T-mobile (my favorite provider in the world), and this random knock knock joke made me laugh: (Unverified) Posted Oct 12th 2007 1:32AM NEUTRAL Knock knock! Who’s there? 12 year old with ADD. 12 year old with AD- Wanna ride bikes? Report – Reply%ChildReplyHTML% (Unverified) Posted Oct 12th 2007 2:03AM HIGHLY RANKED People with multiple personalities can tell knock-knock jokes to themselves!