It is an important evening ahead as the quartet host their first house party for their trendy student friends. After initial problems with Vyvyan's car-engine-powered vacuum cleaner, which sweeps up a morose hippy friend of Neil's, also called Neil (who is mercilessly shoved by Rick into the refrigerator) and an unexpected visit from an eager Christian, the party gets under way in style. (In a short but memorable bit, Vyvyan tries to impress some girls, asking "Wanna see how many press-ups I can do?"; Vyvyan's resulting press-ups had the BBC censors - as recalled by Lise Mayer - thinking Vyvyan was simulating sexual intercourse.)
The party soon turns riotous, with many uninvited guests arriving from the pub. Neil is beaten up, only to awaken in his bed believing the whole episode was a dream. Neil gets out of bed and busies himself as the credits play. At the end, however, party noises cause Neil to realize that "This is the dream!" as he wakes up back at the party.