“My Little Sister” (* out of four) was inept horror schlock about a group of friends (Astrid Di Bon, Holly Dillon, and others) who apparently never watched “Sleepaway Camp” or even “Friday The 13th” and venture on a camping trip in the middle of nowhere where (yawn) a group of backwoods rednecks get their yuks by killing them. Molasses-moving and stupid movie makes one nostalgic for when horror movies used to actually be fun.