Tired of Chris hogging the bathroom every morning, Lucy and Viv decide to trick Harry and Eddie into building a shower in the boys' room. When Joe, the plumber Harry and Eddie secretly hire to do the work, quits after Lucy insults him, Lucy and Viv must finish the shower, with disastrous results.

When a member of Viv's female barbershop quartet drops out, Lucy convinces them to let her fill the vacancy. To perform well, Lucy takes singing lessons to stay on key, but her instructor can do nothing for Lucy’s stage fright when she learns that their first performance is in front of 3,000 people.