
WHICH is metal you melt
to make science things.
The Big Bang Theory Season 9, Episode 19

WHICH means I'm gonna have to google
how to play catch.
The Big Bang Theory Season 9, Episode 21

Just to clarify, WHICH one
of you is wearing the bikini?
The Big Bang Theory Season 7, Episode 19

and you have to decide WHICH,
The Big Bang Theory Season 12, Episode 14

Which brings up
an interesting question.
The Big Bang Theory Season 12, Episode 9