Whack of the P-Rex is volume 5 of the series The Notebook of Doom.  This is the first installment of this series that I have read, and honestly, I’m not sure what to make of it.  I checked other reviews online to see what others had to say, and for the most part, all of it was pretty positive.  I think it must just be my lack of taste for slapstick type of comedy.  In this book, P-Rex is a monster, a giant-sized pinata in the shape of a T Rex dinosaur.  Alexander, Rip and Nikki are on their way to school with their science projects, ant farms, when they come upon a lot of candy on the ground as well as giant footprints.  More clues throughout the day give them leads as to what is causing this disturbance.  They find the monster and deal with him the way kids would deal with a pinata: hit it with a stick.  Inside the P-Rex there is a skeleton made entirely of candy.  The funniest thing to happen was that this skeleton broke the giant ant city, belonging to the teacher, and all the ants swarmed him to get at the candy. The ending is terrific.  Illustrations are funny and appropriate to the story.  Text is at 2nd grade reading level and kids seem to enjoy the silliness of it all.