In Z Blink of an Eye

Things often happen so fast that if you weren't paying attention at the time then you missed it, because so many things happen in the blink of an eye.

Such as the red sunrise of a smoky morning seen through the doorway of a building across the street. Blink and you missed it.

Or an iguana using the crosswalk to get across the street. Blink and you missed it (and probably run over the iguana).