This scene from last week is a flashback to the prior year's Thanksgiving. Nate (Chace Crawford) brings a drunk Serena (Blake Lively) to get cleaned up, but ends up getting into a water fight with the showerhead. Then Blair (Leighton Meester) comes to check on them... and gets hosed down herself!
Such a sweet and silly scene. Follow this link for a bunch more Gossip Girl videos and clips from last week's episode, "Blair Waldorf Must Pie!"