You visit a car maker’s museum housed in one of their old factories. Your tour guide is a young man of about 30 who seems to have an uncanny knowledge of how the cars were made and how the factory operated, even though the vehicles had been obsolete for decades. At the end of the tour, your guide invites you to explore a few more exhibits in the lobby, and he disappears into the dark back rooms. You are struck by one of the displays—a photo and story of a young worker killed on the assembly line in 1951. When you look closer, you realize it was your tour guide.