 Much of the episode's plot revolves around a practical joke with a fake cake that Jim has set up in an attempt to fool Pat. Moving the cake reveals the head of the person hiding under the table, but, in the mean time, the hidden character can hear conversations taking place nearby, unbeknownst to those who are not in on the joke. The episode plays on viewers' guesses as to what has led to the arrival — seen at the opening of the episode — of a paramedic. In particular, the person under the table is at risk of injury if candles burn down or someone puts a knife into the "cake".
