"The origin of the name "Guybrush" comes from Deluxe Paint, the tool used by the artists to create the character sprite. Since the character had no name at this point, the file was simply called 'Guy'. When the file was saved, Deluxe Paint automatically appended the extension '.brush'; before the designers could think of a proper name they got used to referring to 'Guy.brush' when talking about the sprite and decided to use it."