The How I Met Your Mother gang, minus Barney, sit down with Claire (Kim Knight) to warn her about Barney.
Marshmallow gets dragged along as Lilypad attempts to put an end to Barney's playbook and deceit.
All the gang wants to know the whole episode is why Barney is dressed like a SCUBA diver.
Whether Robin is ready to or not, Barney makes it obvious he's ready to use his playbook and move on from Robin.
Barney is back to his old womanizing ways and uses his playbook to remember his old tricks... like dressing up in scuba gear.

How I Met Your Mother Season 5 Episode 8 Quotes

Barney: Barney Stinson is back on the market. Mothers, lock up your daughters. Daughters, lock up your MILSWANCA's.
Marshall: MILSWANCA's?
Ted: Oh wait, I can get this. Mothers I'd Like to Sleep With and Never Call Again
Barney: Correct, circle gets a square

Lily: Barney I've had Shelly set aside for three years
Barney: Dude, Ted was not missing out. She's brainy and annoying. Kind of boring in the sack. Oh I guess she would have been perfect for Ted. Whoops.