It was a riff on an old riddle; "If tin whistles are made of tin..."
Quote:
Tin whistle
Six-holed woodwind instrument
The tin whistle, also known as the penny whistle, is a simple six-holed woodwind instrument. It is a type of fipple flute, putting it in the same class as the recorder, Native American flute, and other woodwind instruments that meet such criteria. A tin whistle player is called a whistler. Wikipedia
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The [jk] is that they're not, like the aluminium thing. Sorry for being obtuse.