The Big Bang Theory: Helium Prank
Physics → Electromagnetism → Magnetic Poles
Sheldon is invited to explain magnetic monopoles to the listeners of the NPR radio channel, and Barry Kripke takes this opportunity to pull a prank on him. Sheldon explains that ordinary magnets have two poles: a north and south. He mentions that cutting a magnet in half would not create a monopole; rather, it would create two smaller magnets, each with its own pole.