We encounter them in courthouses and other government buildings, and especially at airports.  Those blasted metal detectors : take off your shoes, your belt, empty your pockets, and still they go off with an annoying blahhh!

So picture a routine perhaps for a music video or some other entertainment - some one steps through the detector; it goes off; they step back; they take off some article of clothing; they step through and again it goes off; they step back, remove another article and again and again - it's a sort of strip tease for security's sake.

Now picture a whole roll of these detectors and dancers or whatever stepping through and then having to do it all over again and again as they shed more and more clothes.

And maybe the detectors would have different notes to their blahhs, so you'd hear something like a tune, blah, Blah, bLah, etc.

And for a big finish, the barely clad dancers all step through, the detectors go off once more in a resounding chord of blahs while lights flash, fireworks go off, etc.