
...WHICH could give
a positive urine test for opiates...
The Big Bang Theory Season 1, Episode 5

WHICH is why it's now forbidden.
Game of Thrones Season 7, Episode 2

...only one of WHICH is true,
and we don't tell you WHICH one it is...
The Big Bang Theory Season 6, Episode 19

Which one,
the classic, the ranch house...
The Big Bang Theory Season 1, Episode 5

...WHICH laypeople naively interpret
as falling in love.
The Big Bang Theory Season 2, Episode 9