Video: It is damn near impossible to explain the joy that comes from watching Who's Out There, a documentary on aliens made by NASA in 1975 starring real scientists, regular people, and then Orson Welles, pontificating into the camera. I cannot emphasise this enough: Spend half an hour watching this. It starts off strong with its Doctor Who-esque credits sequence. Then Welles talks about becoming friends with H.G. Wells after his infamous War of the Worlds radio play. Then they interview people who had been scared by the broadcast.
It gets barely more normal as it goes on. Once Carl Sagan showed up, my head exploded. Even though a lot of this "documentary" is just Welles monologuing, it's worth it just to hear his voice. Watch it once and then take the mind-addling substance of your choice and watch it again.
[h/t Chris Person, Reddit]