I say it because I’m guessing that you were always potentially scary. Some people are. At some point you learned to control it and use it. And wow.
So (goes my theory, which I’m making up as I go) the people behind the door recognised that potential too, even if they didn’t understand what it was. Some of them might have been looking through metaphorical fingers, as they would at a scary film: “Something’s going to happen…” And some of them would have been relieved at the outcome.
I like the fag-and-(whatever those things are) image. Of course, I’d know it was a gag, and be able to play along. I think. 😊