The first story I ever did submit anywhere went to F&SF and got rejected. I was seventeen.
F&SF was always the magazine I most wanted to sell to because it was the magazine I most enjoyed reading. I loved it -- when Boucher was editing it especially, but under its various other editors, too.
But even when I started selling my fiction elsewhere, even when pretty much all the stories I sent out eventually found a home, I couldn't sell them anything.
Until finally, they bought "Spirit Dump."
And that, to be honest, is practically all I remember about the story's origins. Why I wrote it, where I got the idea -- who cares? All I cared about was that it was the story that finally got me into F&SF, thirty years after I lost my nerve and didn't mail that first one.
I have some vague recollection that I was trying to do something with New Age ideas of visualization, and maybe the title came from somewhere and I wrote the story to fit it, but other than that, I forget.
But it sold to F&SF!
That's it; here's your list of handy exits: