Serial number's been filed off.
Breaking Bad Season 4, Episode 2
Serial Ape-ist 2:
Monkey See, Monkey Kill.
The Big Bang Theory Season 7, Episode 19
If you don't count the SERIAL killer
who ate all those prostitutes.
The Big Bang Theory Season 6, Episode 18
...between my co-star from Serial Ape-ist 2
and her fiancé...
The Big Bang Theory Season 8, Episode 20
for carrying a weapon
with a defaced SERIAL number
if you buy it legally.
Breaking Bad Season 4, Episode 2