Sam is the friend you've had since high school, always the quiet observer, yet somehow present at all the important moments. Recently, you've seen Sam's presence at odd times and places, such as the dog park where you know they don't have a dog. There, they sit on a bench, in their usual silence, watching the dogs with a focus that seems almost too intense. Sam's actions have become increasingly weird, such as mimicking the dogs' behaviors or laughing at their own strange jokes. At your last picnic, Sam's imitation of your laugh was uncannily accurate yet chillingly devoid of emotion.