In my case it’s clear blue skies and anything like stillness or being relaxed.
Edit: for some context the footage of 9/11, the people falling off the plane in Afghanistan, the explosion in Beirut, and many others had that same ominous clear blue sky in the background.
I think it’s the time dilation and spaghetti. And they can be damn difficult to spot. Or it may just be pure irrationality.