We read a book when I was in fifth grade called "Figgy Pudding." Most of the book was just the main character going through his life with his family. There were stories about them, like, going to celebrate Christmas with their extended family, or the baby getting sick because he ate too much butter, or the cat getting stuck. Normal slice-of-life stuff. In the second-to-last chapter, the protagonist's little brother gets hit by a truck while he's riding his bike. The last chapter is the family going to the funeral. It was a very, very sudden shift towards darkness.
Spoilers like that aren't so bad if they are given without context. Some spoilers I actually like because I know what happens, but not how or why so its fun to speculate.
There is a sequel to this, in which Orange Pekoe joins and says something that upsets all three.
I think Pekoe gave more spoilers, upsetting them all.
Huh?!*CLATTER**CLATTER**CLATTER**CLATTER*Sorry, my bad! I was wrong about that!Upset x 2Just kidding with you!That's like me saying that the protagonist's younger brother gets run over by a truck!See~ Surprising, isn't it?Wait, that doesn't happen until season 3...Ah!