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.
You can use it as a paperweight AND an instrument, so it's still an instrument
Good point. What if, at all times, EVERYTHING is an instrument?
you are an instrument
Correct! The voice IS an instrument and, as a nice little bonus, when I fall down the stairs I become a percussion instrument!