Matt McIrvin's Freaky Alternate Reality

As I skimmed past this post in my friends list, deciding it was worth saving to read when I'm less distracted, my eyes fixed on the phrase, jammed against the left margin a small distance in:

there was a knock at the door

and a song burst into my head.

There's a nut with a shotgun bang bang bang
There's a doctor, a waitress, a fireman with a hat
There's a nut with a gun
There's enough so they'll never know which one...

All at once, the idea of answering doors seemed like a bad one.