When Penny falls ill with the flu, the others force her to the basement to save themselves. It doesn't work though, and one by one they all fall ill, messing up all of their plans. Bob and Pearce are the last two standing and take some time to bond. Penny and Paige also bond over an unlikely activity. Pearce makes a fashion statement, and creates a new language- ""mathlish"". (thetvdb.com)