This is another classic book from when I was a kid. I’m not sure whether it is still in print but it’s one to look for at used book stores.
Unlike some of the other Sesame Street books from that era (the 70s), this one is better for kids to look at on their own rather than as a bedtime story. The illustrations by Joe Mathieu are so whimsical and full of detail that kids can spend hours finding every little thing.
My kids were scared of this book at first and it took a lot of convincing to read it. After they saw the twist ending however, they asked for it over and over, proud that they had conquered their fear. A classic.
An interesting dynamic occurs after the first few pages, when Grover begins begging the reader to not turn the page. Sometimes the kids think we shouldn’t turn the page and just put the book down, honoring Grover’s wishes. And other times they gleefully demand we turn the page even though we’re being asked not to. This gives the kids some agency and a sense of violating the rules, in a harmless way.
This is a fun one to read aloud because Grover gets so emotional and worked up over the course of the story.