
( train WHISTLE blows )
Westworld Season 2, Episode 6

- Can I WHISTLE?
- Don't be silly.
The Big Bang Theory Season 2, Episode 13

Oh, danger WHISTLE.
The Big Bang Theory Season 8, Episode 19

I'll be blowing the WHISTLE.
The Big Bang Theory Season 10, Episode 15

Is it a high-frequency WHISTLE?
The Big Bang Theory Season 2, Episode 10