I have a contractual OBLIGATION...
The Big Bang Theory Season 6, Episode 1
You haven't given me a gift,
you've given me an OBLIGATION.
The Big Bang Theory Season 2, Episode 11
As teacher, it's your OBLIGATION
to separate your personal idiosyncrasies...
The Big Bang Theory Season 1, Episode 17
No one is under OBLIGATION to call me lord.
Game of Thrones Season 4, Episode 6
...an inherent OBLIGATION
to maintain confidences?
The Big Bang Theory Season 2, Episode 1