Buffy catches Giles kissing her mother!
Buffy is worrying about her SATs, she's been secretly visiting the newly-returned Angel, and she's in trouble with her mother and Giles. Xander and Willow are playing footsie under the desk, though Xander and Willow are meant to be in relationships with Cordelia and Oz. The Mayor - one of the greatest Buffy villains - has hatched an evil plan which is being carried out by Mr Trick, another excellent bad guy.
Principal Snyder wants to be one of the gang
They arrange for Principal Snyder to give his pupils chocolate to sell. Ostensibly this is to raise money for the school band, but in reality it causes all the adults in town to start acting like teenagers. This leads to great scenes of craziness in the Bronze, where previously responsible citizens get up on stage to sing Louie Louie. Principal Snyder acts like a kid and wants to be one of the gang.
Buffy's Watcher Giles goes off the rails, reverts to his bad old youthful ways, talks of getting a band together, and hooks up with Buffy's mum. They rob a shop and then have sex on the bonnet of a police car! It's all great. (It was some time till Buffy found out that Giles and her mum actually did have sex, and that was in another good episode, featuring a suicidal Jonathan.)
Yes, Band Candy was a brilliant episode. I didn't regret watching it again. In fact, I felt quite inspired to get on with writing. I've often found Buffy the Vampire Slayer to be very inspiring.
Xander and Willow are playing footsie
Giles and Joyce move on to the police car