
Why? The theory he came up with
just got mentioned in Scientific American.
The Big Bang Theory Season 8, Episode 18

Why are we fighting?
The Big Bang Theory Season 7, Episode 10

Why would you do that?
The Big Bang Theory Season 5, Episode 17

If one Hand can die,
WHY not a second?
Game of Thrones Season 1, Episode 5

That's WHY you had him executed.
Game of Thrones Season 2, Episode 1