Ninth?
The Big Bang Theory Season 5, Episode 15
did this as our science fair
projects in NINTH grade.
The Big Bang Theory Season 11, Episode 13
In NINTH grade, the girls put
Rogaine in my hand lotion.
The Big Bang Theory Season 5, Episode 11
slip out of the NINTH floor,
and go on a little adventure?
The Big Bang Theory Season 5, Episode 18
Ninth time's the charm.
The Big Bang Theory Season 6, Episode 5