Buffy is still finding it impossible to get over the way Parker treated her; she imagines they might get back together even as she watches him flirt with other girls. Then one day she goes to the pub where Xander is now working as a barman and ends up drinking beer with four obnoxious frat boys. As the night goes on their IQ rapidly diminishes. While this is going on Willow is at the Bronze with Oz but he seems more interesting in the female singer on stage. The next day Buffy seems a bit out of it but nothing worse than a bad hangover... another evening drinking with the boys and things get worse; they seem to revert to an atavistic, caveman like state. Inevitably things get worse before they get better.
This might not be the best episode but I still found it rather fun. The way the beer effected Buffy and the boys was funny and not too rushed; I also liked the explanation as to why it affected them that way... nothing complicated or overly evil; just a one line explanation. This also meant the episode had no real villain which made a change. The episode also had some character development; I think it is safe to safe the 'Parker Situation' is over but a new situation may be developing between Willow and Oz. The cast did a fine job; Sarah Michelle Gellar was great as she played 'Cave girl Buffy'; Alyson Hannigan was a delight as Willow, especially in the scene between her and Parker; and Nicholas Brendon did a fine job as Xander gets flustered taking an order at the bar. The episode's ending was suitably light hearted. Overall I'd say that even though this might be considered a filler episode it is definitely worth watching.