Gossip Girl. Season 1. Episode 12

IMPROMPTU PARTY AT THE SCHOOL SWIMMING POOL
Serena,
Blair, Nate, Chuck and their entourage break into the school swimming
pool for a night of fun, but when a member of their group nearly
drowns, the school threatens to expel the person responsible for the
break-in. Everyone agrees to keep a secret pact and say nothing, but it
ultimately creates major tension between Serena and Dan, who isn't sure
he's ready to take the fall for someone else and risk his future.
Vanessa is working on a documentary project about private schools and
accidentally captures Blair and Chuck discussing their affair. Lily
contemplates telling Rufus how she really feels about him.

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