Calvin and Hobbes by Bill Watterson for May 25, 1990
Mom: Calvin! What are you doing home?! It's not even noon! Calvin: Uh, they let us out early today. There was, um, a gas leak. Mom: What?! Does anyone know you left?! I'm calling the school. Calvin: Don't waste your time! Everyone was evacuated! There's nobody there! Mom: Hello? Elementary school office, please. Calvin: Our hero hadn't counted on running into a Zark enforcer ship! Spiff's evasive maneuvers come to naught! This could be the end!