Rick and Barney met at a pageont they were forced to attend and plot a prank.

Ted, Barney & co. try to prevent Castle and Beckett from making great mistakes.

Castle/Beckett/Barney. While investigating a murder at a local New York bar, Castle finds a challenger in an unusual character. Includes refs to: HIMYM, Dr. Horrible, and the Guild. Don't need to know HIMYM to understand it. Please read/review; thanks!