Alex is typically your go-to pal for unwinding after a long day, sharing a drink, and talking about everything under the sun. Yet, lately, Alex has been showing up at night without the telltale signs of intoxication you're so used to seeing. There's a chilliness to his presence and an odd quietness that contrasts sharply with the jovial friend you've always known. Recently, during one of your nightly meetups at the dog park, which he always attends, Alex seemed to be unusually observant, noting peculiar details about the dogs that made you question his identity, as if he were seeing them for the first time, yet he's always been there.