MPAA Rating: R/Genre: Monster Horror/Stars: Melissa Barrera, Dan Stevens, Alisha Weir, Will Catlett, Kathryn Newton, Kevin Durand, Angus Cloud, Giancarlo Esposito, Matthew Goode/Runtime: 109 minutes Among the many things I never understood when I was growing up, there was one that (for the purposes of this review) proved to be…