xkcd author Randall Munroe signs a playpen ball with a man in a hat, a character featured in many of Munroe’s strips. Omari Stephens—The Tech May. 8, 2016 Facebook Twitter Reddit Print xkcd author Randall Munroe signs a playpen ball with a man in a hat, a character featured in many of Munroe’s strips. Omari Stephens—The Tech