Physics students thinking they've outsmarted the universe with their "brilliant" perpetual motion machine, only to get smacked by the laws of thermodynamics. The meme shows the classic "portal perpetual motion" thought experiment where water flows through one portal, falls through another, powers a turbine, and supposedly creates infinite energy. Spoiler alert: The Second Law of Thermodynamics is sitting in the corner, laughing hysterically at your "genius" plan. Energy can't be created or destroyed, but dreams of free electricity certainly can be!