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

Yes, who do you think gave him
the danger WHISTLE?
The Big Bang Theory Season 8, Episode 19

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

There are dozens of railroad crossings
you have to blow the WHISTLE for.
The Big Bang Theory Season 10, Episode 15

(WHISTLE BLOWS)
Westworld Season 3, Episode 8