
one day a week
for a trial PERIOD.
The Big Bang Theory Season 7, Episode 24

Well, he used a PERIOD
instead of a question mark,
The Big Bang Theory Season 9, Episode 16

Finally got your PERIOD?
Heh.
Breaking Bad Season 4, Episode 7

We based this park
on Japan's Edo PERIOD
Westworld Season 2, Episode 5

Well, maybe my male cycle
synced up with Raj's actual PERIOD.
The Big Bang Theory Season 9, Episode 21