High Quality Content by WIKIPEDIA articles! A113 (sometimes A-113 or A1-13) is an inside joke present as an Easter egg in animated films created by alumni of CalArts, referring to the classroom number used by graphic design and character animation students at the school that was used by John Lasseter and Brad Bird among others. Brad Bird first used it for a license plate number in the "Family Dog" episode of Amazing Stories. It has since appeared in other Disney movies and every Pixar movie.