That was when he saw the door.
A declassified memo (now largely dismissed as disinformation) describes a test pilot who inadvertently flew his F-104 Starfighter through a "temperature inversion" that was actually a tear in spacetime. The pilot reported over radio: "The sky isn’t blue. It’s a wall. There are faces in the wall. Wait. They’re not faces. They’re tools. I’m in someone’s ... yard. Oh God, I’m in his backyard ." The transmission ended. The pilot was found three days later, sitting in his living room, having aged 40 years and humming a tune that caused houseplants to wither. Yog-Sothoth-s Yard