I was watching an old movie - one of Clint Eastwood’s - A few Dollars More - and realised they were using a whistle of some kind to carry the melody in the theme and background/incidental music.
Never noticed this until I started playing whistles, but it’s a familiar sound…
From the thread title, I had visions of a Steve McQueen type running down a bail jumper by throwing a low whistle at his feet to trip him up and then battering him into submission with its twin from his other holster.
A number of Ennio Morricone compositions seem to be written with whistle-friendliness in mind, except that they tend to modulate up a half-step in the last verse. To play along with such tunes, it helps to have both a D and Eb whistle handy. For a Few Dollars More is a blast to play on the whistle, and on the record it sounds like it contains both a standard six-hole whistle and a “human” whistle.