There's only three people in this house,
and you'd still be my FIFTH guess.
The Big Bang Theory Season 10, Episode 10
I was done with Latin by FIFTH grade.
The Big Bang Theory Season 3, Episode 2
It's more likely that you will spend
your careers teaching FIFTH graders...
The Big Bang Theory Season 2, Episode 6
I study the brain, the organ responsible
for Beethoven's "Fifth Symphony."
The Big Bang Theory Season 4, Episode 24
Oh, not just date night.
Our FIFTH anniversary.
The Big Bang Theory Season 8, Episode 24