For school assignments, I always wrote a lot of what could charitably called “speculative fiction” (or, less charitably, “nonsense”). Here’s a very short example, most likely from elementary school, although it’s hard to tell because I didn’t bother to date it, or even to put my name on it:
The astute reader may recall a story arc from the classic comic strip “Calvin and Hobbes” in which Calvin’s bicycle goes all Christine and tries to kill him. I can only assume that Calvin’s father bought the bike from this story after I put it up for sale. All I can say is, caveat emptor.