Calvin and Hobbes by Bill Watterson for October 23, 1989
Transcript:
Calvin: The strangest thing happened to me a few minutes ago. Mom: Oh? What? Calvin: I was minding my own business, when suddenly I was zapped into some sort of space vortex! There I watched helplessly as an evil duplicate of myself from a parallel universe took my place on earth, and... Mom: What have you done now? Calvin: No, no, see, it wasn't me...
At least the excuse is inventive.