When the Weir parentals go out of town for the weekend, Lindsay's new friends decide it would be a good idea to throw a party, and Lindsay reluctantly agrees, mostly in hopes of impressing Daniel. They buy a keg for the party. A school assembly about alcohol freaks out Sam and his friends and they get worried about the party, and hatch a plan. They buy a keg of nonalcoholic beer and replace it.
However, their plan backfires. The keg has a placebo effect on the partygoers and they all think they're drunk, so they act like they are. Lindsay fails to get anywhere with Daniel; he and Kim hook back up.
This episode was both hilarious and dramatic. Millie singing the Jesus song was a great scene, and the most memorable for me. Bill's getting drunk is a definite close second.