I know it's CUSTOMARY
for the birthday boy to receive presents,
The Big Bang Theory Season 9, Episode 17
it has been CUSTOMARY for our ruler
to make the rounds of the lower pits
Game of Thrones Season 5, Episode 7
It was CUSTOMARY for me
to extend him an invitation.
Game of Thrones Season 2, Episode 5
It's CUSTOMARY, when
using the restroom
The Big Bang Theory Season 5, Episode 13
It is CUSTOMARY to kneel
when surrendering to a king.
Game of Thrones Season 4, Episode 10