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