Wanted: Monsters

leonardo%20the%20terrible%20monster.jpgI have a recommendation request:  A friend of mine (Madelyn, also a children's writer) is looking for monster books to read aloud at her daughter's preschool fundraiser.  Friendly monsters preferred, for obvious reasons.  She'll be starting with Where the Wild Things Are by Maurice Sendak ("Because how could you not?")and Leonardo, the Terrible Monster by Mo Willems (coincidentally one of my favorite Willems books) and needs a couple more to round out the selection.

We don't read a lot of monster books over here ourselves:  Leo doesn't like them (monsters or their books), and Milly's not terribly interested (ha!), so I haven't been much help.  Now I'm curious, too:  What are your favorite monster books for read-aloud?  Just don't scare me!