Which he only did once.
The Big Bang Theory Season 10, Episode 24
WHICH pounds them
through the wood of your skull.
The Big Bang Theory Season 12, Episode 7
WHICH is a good sign.
The Big Bang Theory Season 7, Episode 15
Just to clarify, WHICH one
of you is wearing the bikini?
The Big Bang Theory Season 7, Episode 19
And the moment I learn WHICH tent is mine,
we're on the move again.
Game of Thrones Season 2, Episode 4