Several easter eggs exist in MATLAB. These include hidden pictures, and random inside jokes. For example, typing in ""spy"" will generate a picture of the spies from Spy vs Spy. ""Spy"" was changed to an image of a dog in recent releases (R2011B). Typing in ""why"" randomly outputs a philosophical answer. Other commands include ""penny"", ""toilet"", ""image"", and ""life"". Not every Easter egg appears in every version of MATLAB – some appear and some disappear.