I never read the Goosebumps books growing up, but my younger brother was a big fan. It was easy to understand their popularity: author R.L. Stine would take well-known monsters and insert them into our daily world in a way that was thrilling, but not unnerving. Those thrills have returned in Rob Letterman’s adaptation of the book series, and while “PG Horror” seems like an oxymoron, Goosebumps skillfully employs movie monsters to create an unabashedly good time. Even if you’ve never read a single Goosebumps book, you can tell how much love the film has for the source material, and how Letterman wanted it to leap off the page, both literally and figuratively. The result is a monster rampage that’s an absolute delight.