The line comes from Plan 9 from Outer Space, the 1959 low-budget film by Ed Wood often called one of the worst movies ever made, where Tor Johnson plays Inspector Daniel Clay, a policeman investigating alien attacks. Johnson, a Swedish professional wrestler turned actor, delivered the line with his famously thick accent and stiff presence. Clips of it spread on soundboards and meme pages as a bedtime sign-off, and it keeps circulating because the broken English makes it funnier than any polished quote.