r/TrueScaryStories:

Story 1: OP's grandfather is outside later than usual and hears what he thinks is his wife calling his name. He was mistaken...

Story 2, "Stalked by a Killer": OP and their friend were going to have a party, but then canceled plans and just had a sleepover instead. They notice a visitor outside the house, who they at first think is odd, but not that big of a deal. What happens later makes them realize how much danger they were actually in.