Technically speaking, an Easter egg is an intentional inside joke, hidden message, or feature in a work such as a computer program, video game, movie, book, or crossword. According to game designer Warren Robinett, the term was coined at Atari by personnel who were alerted to the presence of a secret message which had been hidden by Robinett in his already widely distributed game, Adventure. Did you know that both R2-D2 and his good companion C-3PO appear in the hieroglyphics during the Well of Souls scene in Indiana Jones and the Raiders of the Lost Ark? Continue reading for more.