Now I'm thinking about the ORIGIN
of the phrase "train of thought."
The Big Bang Theory Season 4, Episode 20
Excuse me, Wolverine: Origin
Miniseries Issue 2, page 22.
The Big Bang Theory Season 3, Episode 2
Oh, I don't know. Maybe because
the ORIGIN of the universe
The Big Bang Theory Season 7, Episode 20
There's the ORIGIN
of an entire species
to consider.
Westworld Season 2, Episode 9
Usually Mantari in ORIGIN.
Game of Thrones Season 4, Episode 10