"Folie a Deux" was also the name of one of my favorite X-Files episodes, the one where the telemarketing boss was also an evil creature (as someone who worked a few telemarketing jobs, that episode seemed more like a documentary to me).

This was a Goren/Eames episode. Is it just me or does D'Onofrio look more and more unhealthy/disheveled? I know, I know, it's part of his character arc, but still...