Thelonius Monster’s Sky-High Fly Pie by Judy Sierra, illustrated by Edward Koren.
Released May 9th, 2006.
This book had my four-year-old talking for days, which is exactly what you want a book to do for a child.  Thelonius Monster ate a fly and decided that flies would make a great pie.  So he created a crust and covered it in goo.  Then he went all around to likely spots gathering flies.  He then dumped them into the goo where they all stuck.  He invited his friends to come and share in the delicious fly pie.  But in the end, the monsters do not get to devour the pie after all.
The book is grand fun.  Disgusting, icky, messy, and pure child heaven.  I occasionally do a gross storytime for preschoolers and kindergarteners.  This one will fit right in.  It has a great storyline throughout with a surprise ending that will have kids giggling in glee.  Share this with any child who loves bugs, dirt, and monsters.  This is a winner!