Really, I do.
When I started my writing adventure, I was fond of markets that accepted simultaneous submissions. I was unpublished and desperate. I think I've been cured, once and for all, of that fondness.
I had a piece accepted by a market today that I pulled from said market over a month ago. My withdrawal letter evidently slipped between the cracks in the InterwebTM, so I had to write an apology and pull the story from publication.
I feel stupid and ashamed. I'm done with simultaneous submissions. Period.
Except for novels, that is. Except for novels. Having more than one offer for one of those would be akin to a thermodynamic miracle.
Yes, the Morlocks are from The Time Machine. If you've never read the book, I highly recommend it. Download the text for free at Project Gutenberg. Reading the book will help you understand my Wiki / Morlock comparison.