a force of habit
Obi-Gyn Kenobi.
May the force be with you just like every other day because they have no concept of our Gregorian calendar.
Nun!
Absolutely nun
Someone who stays up all night wondering if there really is a dog.
Hare in your milk!
He was forced to resort to excessive violins.
They both made habits fashionable.
It takes 21 days to make a habit.