The game has inspired various real-life recreations, involving real people or robots. One event called Pac-Manhattan set a Guinness World Record for "Largest "Pac-Man" Game" in 2004. The business term "Pac-Man defense" in mergers and acquisitions refers to a hostile takeover target that attempts to reverse the situation and instead acquire its attempted acquirer, a reference to "Pac-Man"s energizers. The game's popularity has led to "Pac-Man" being adopted as a nickname, such as by boxer Manny Pacquiao and the American football player Adam Jones. The "Pac-Man renormalization" is named for a cosmetic resemblance to the character, in the mathematical study of the Mandelbrot set.