Barney Stinson has spent the last 2 years slap-free, with 3 of the 5 slaps he lost to Marshall already administered. This November 23rd, the 4th slap was consecrated. And to mark the event, the producers of HOW I MET YOUR MOTHER want all of us to join the fun! Here's Slap Bet: The Game!
(Notice the song, same that Marshall composed for Barney 2 years ago?...)