I've been working on a short story today, something that's been bubbling away in my imagination for a week or so. I'd got most of it worked out in my head - the characters, the storyline, the key scenes that needed to be there. And today I had the leisure and the health (I've been feeling rough this week) to sit down and write it.
And 1500 words in it suddenly becomes clear that it will work better if I focus on someone that in my original idea was going to be more or less incidental, and if the characters that I had decided were the key characters be introduced more tangentially.
I quite enjoy stories with a twist, but why do they insist on springing their surprises on the person trying to write them?