The episode concludes several long-running storylines as the ceremony begins:
: Robin quickly realizes the truth—Barney’s initials are "B.S." for a reason, and he lies about everything. She briefly considers running away with Ted, who firmly refuses, telling her he is "not that guy anymore". The Meeting: Robin and The Mother [S9E22] The End of the Aisle
: Barney witnesses Marshall and Lily’s messy, honest life and decides on a single vow: to always be honest with Robin. He immediately confesses that Ted was the one who found the locket. Marshall and Lily’s Real-Life Vows The episode concludes several long-running storylines as the
: Barney stays true to his word and actually brings a real bear cub as the "ring bear". He immediately confesses that Ted was the one
: Robin walks down the aisle to an instrumental version of "Sandcastles in the Sand," the song that first sparked her romance with Barney.
: Just as Barney has a last-second panic attack at the altar, Marshall delivers the eighth and final slap of the Slap Bet , officially ending the years-long gag.