How I Met Your MotherSeries 9 Episode 12: The Rehearsal Dinner
Barney becomes convinced that Robin is planning to throw him a special wedding rehearsal dinner at the laser tag arena, which infuriates her and the gang. Meanwhile, Ted attempts to learn to play the piano so that he can fulfil his promise to perform at the wedding ceremony dressed as Liberace, but the task is beyond him. Elsewhere, Lily struggles with the fact that she can't keep a secret.
- Original air date