LUNG TEST PRANK

This is an old “Lung Tester Prop” and you would blow into it and the air would flow through it and move the little paddle-wheel thingy. And you would say that the longer you could blow and move the wheel the better your lung capacity was for diving purposes. Or something.

But, when the other person goes to try it, they end up blowing a bunch of powder into their face.

This is known as a BLOW BACK TALCUM POWDER PIPE as well.

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