Calvin and Hobbes by Bill Watterson for May 27, 1992
Calvin: Do you mean to say it's time for bed and you still haven't written our story for school?! I figured the story was already done! How could it be done if you didn't write it?! Obviously it had to be done before now, because it's 8:30 and I'm supposed to be in bed! Wait a minute! If the story had been written in your past, that would mean I should've written it! Well why didn't you?! Because I came to the future to pick it up when it was done! If you hadn't screwed up my past, your future wouldn't be like this.