"Made up my mind to date both of them
by pretending to be TWIN brothers."
The Big Bang Theory Season 9, Episode 14
...and his five TWIN brothers,
you are wasting your time.
The Big Bang Theory Season 1, Episode 16
but when they're TWIN primes,
The Big Bang Theory Season 9, Episode 12
...since I beat out my TWIN sister
for the "Did It On The Potty" trophy.
The Big Bang Theory Season 8, Episode 23
I grew up with an older brother
and a very contentious TWIN sister.
The Big Bang Theory Season 3, Episode 2