Because they have nothing to fret about!
Dont fret about it.
Don't fret
Now, don't fret about it!
He was always fretting over something or other...
They start to fret.
It didn't have any pickups
No strings attached
He had a high pressure job
Rustle
Because he doesn't want to be nailed to the boards.
They told me I wasn't putting in enough shifts.
Tell her a joke on a Monday!
They like it!
Because they don't know how to use Occam's razor
Chicken sees a salad.
They're both looking for a tight seal.
I can't remember the name. I think it starts with T. Really - Ours only starts with gas.
When the color of the license plates start to change.