...since I beat out my TWIN sister
for the "Did It On The Potty" trophy.
The Big Bang Theory Season 8, Episode 23
but when they're TWIN primes,
The Big Bang Theory Season 9, Episode 12
I grew up with an older brother
and a very contentious TWIN sister.
The Big Bang Theory Season 3, Episode 2
I have a TWIN sister
whose assaults began in utero.
The Big Bang Theory Season 3, Episode 17