Simple. Take your local catalytic converter. If you don't try hard enough, it's just a catalytic converter. But if you do make it make music, then it becomes an instrument.
What if you are wrong about everyone being wrong? It's totally impossible they are all wrong. Besides, even if they did, someone should've already disproven it by now, right?
I know I'm not wrong because I can use a trumpet as a paperweight instead of an instrument. That trumpet is not being instrumented, it is a mere paperweight.
