Calvin and Hobbes by Bill Watterson for August 22, 1992
Transcript:
Mom: Whooo! It smells awful in here! Why does your room stink? Calvin: It's because of the darn monsters under my bed! Mom: Calvin, I don't believe for a minute that your nighttime "monsters" are causing this smell. Calvin: But it's true. See? They don't eat all the garbage we throw down there to keep 'em quiet.
It’s quite simple, really.