Without a doubt, the addiction drama “Beautiful Boy” – not the slasher-flick “Halloween” – is the most terrifying movie opening at the multiplex this weekend. Starring Steve Carell (“Foxcatcher”) and Timothee Chalamet (“Call Me by Your Name”), the movie is a chilling and unsettling look at a young man’s plunge into meth addiction (and heroin, pills, pot, etc.) and a devoted father’s efforts to save him.