Once upon a time, on a very bad morning, Barney offered Lily his famous Hangover Fixer Elixir.

With the wedding ceremony just hours away, things look desperate when Robin can't wake Barney. "Rally" is the 18th episode of the show's ninth and final season.

Will Lily and Robin be able to rouse Barney before it's time to walk down the aisle on How I Met Your Mother?

No, Robin's not drowning Barney but she might like to considering how hungover he is on the morning of their wedding on How I Met Your Mother.

It's safe to say Barney has had too much to drink. Not that we're judging the awesome How I Met Your Mother character.

Robin gets a drunken Barney to spill his secrets on How I Met Your Mother. "Unpause" is the 15th episode of the show's ninth season.

Marshall plans his next slap against Barney on How I Met Your Mother. "Slapsgiving 3: Slappointment" is the 14th episode of the show's ninth season.

Ted and the others sit around their booth telling stories.

Despite having multiple options, Ted still manages to make the wrong choice in his date for the wedding on How I Met Your Mother. "Knight Vision" is the sixth episode of the show's ninth season.

Barney's stuck in the middle when Robin has an argument with his family on How I Met Your Mother. "The Poker Game" is the fifth episode of the show's ninth season.

Ted and Barney deal with their Robin issues on How I Met Your Mother. "The Broken Code" is the fourth episode of the show's ninth season.

AWWW! Barney and Robin share a kiss in this scene from How I Met Your Mother.