
He was so busy figuring out
how many parts PER million of urine...
The Big Bang Theory Season 8, Episode 9

Accelerating at an initial rate
of 32 feet PER second.
The Big Bang Theory Season 1, Episode 2

And how much profit do you make
PER Penny Blossom?
The Big Bang Theory Season 2, Episode 18

Ooh. Well, l haven't had any training,
PER se.
Breaking Bad Season 4, Episode 9

from space
at 500 miles PER hour,
The Big Bang Theory Season 5, Episode 23