
It's May the FOURTH.
The Big Bang Theory Season 7, Episode 22

The FOURTH time was the charm.
The Big Bang Theory Season 6, Episode 22

Dr. Fowler, you would be
only the FOURTH woman
The Big Bang Theory Season 12, Episode 19

Mrs. Wunch in FOURTH grade.
The Big Bang Theory Season 9, Episode 23

That's the FOURTH time
she's been to the bathroom
The Big Bang Theory Season 12, Episode 23