That COULD not be less arbitrary.
If it varied even slightly...
The Big Bang Theory Season 2, Episode 18
He COULD temper her worst impulses.
Game of Thrones Season 8, Episode 4
Or we COULD just have a life.
The Big Bang Theory Season 1, Episode 7
You COULD block it with a Frisbee.
Calm down.
The Big Bang Theory Season 6, Episode 8
If there's anything you COULD
find out, it'd be great.
The Big Bang Theory Season 11, Episode 8