the OBVIOUS answer is,
they engaged in coitus.
The Big Bang Theory Season 5, Episode 1
was an OBVIOUS reference
The Big Bang Theory Season 7, Episode 3
I'm missing something OBVIOUS
you're about to point out?
Game of Thrones Season 3, Episode 4
...all the OBVIOUS answers.
The Big Bang Theory Season 6, Episode 4
but it’s OBVIOUS they’ll try
to infiltrate someone.
Money Heist Season 1, Episode 5