German soldiers are in a U-Boat and are being attacked by depth charges. They decide to surface after suffering numerous blows and the loss of several crew members.

Beakman explains who made the toilet and then shows a cross-section of a toilet to show the inside. Then he uses colored water to show how gravity pushes the waste out of the toilet into the drain. He then shows how the back tank of the toilet works with valves and gravity to push the water in the toilet bowl down into the drain.

Phoebe tricks Lester into thinking she created a water multiplying machine. In reality, she creates a siphon that causes the water stored in a bottle to flow out due to water pressure.

Galileo explains to his student that, if two balls are dropped at the same height, they will both hit the ground at the same time, regardless of their weight.

Mr. Seaver begins teaching the class a lesson on gravity out of the textbook. He is especially confused by the book's claim that a coin and a feather will fall at exactly the same speed. After Luke challenges him to prove it, he tests the claim.