Incoming what? Catch what, you ask. Plots, that's what. I'm not a plotter, never have been, tried it but it's not something I've perfected. Perhaps I should.
Even though I'm not a plotter I've had to duck and then catch a few times, usually as I'm about to fall asleep. That's the time when the brain is winding down and all those thoughts that are usually blocked run free. It's also why most writers have a note pad next to their bed. I don't have a note pad - do you see a pattern? I'm a bit of a rebel. I may not have a note pad, but I do have an e-reader which I can make notes on. I've done that a few times.
Other times it can happen when you're in the middle of a scene and an extra walks in and you go, hmmm what is their story. They stand patiently while you make a quick note then move on.
I had that happen on my recent WIP (the partial of which got an R :-( ). Anyway this character popped up and she's still in the back of my mind. She's got a story there, but as she's just had a personal tragedy she's waiting until that special someone comes into her life - or should I say, he shows himself in my mind. I'm looking forward to when that happens.
It's the life of the writer and I love when it happens, sometimes I wish it would happen a bit more.