The Circle Game is a playground prank that dates back decades but found a massive second life as a viral internet meme. The goal of the game is to trick someone into looking at a circle formed by one's thumb and index finger held below the waist; if they look, the prankster gets to punch them in the arm. On the internet, this evolved into hiding the hand gesture in unexpected places within photos and videos, from professional sports broadcasts to social media selfies. It represents a universal language of playful deception and remains a staple of gotcha culture online.