In the movie Inside Out, the main character, Riley, had an imaginary friend named Bing Bong who was described to be part elephant, cat, dophin, and cotton candy. Each of these animals (or food) matches up with a certain part of his body, except for his brightly colored orange and yellow legs. Many questioned where these legs "came" from, meaning where did Riley see orange and yellow striped legs that were included in Bing Bong as a figment of her subconscious? If the Pixar Theory is true, and the movies are interconnected, then each child in every film would also have a monster, as in a monster who visits children through their closet from    the movie  Monster's Incorporated. George Sanderson, pictured right, is a monster who was seen in Monster's Inc., with the same specifically patterned legs. So, fans put two and two together and theorized that George was Riley's monster! She would have seen him enter her room every night, and either as a form of coping or familiarity (depending on whether George was a scarer or comedian at that point), she would use his legs in her imagination friend.