Lots of non traditional instruments get called for in concerts. I played a song that called for drumming on upturned metal trash cans in high school.

Is mayonnaise an instrument?

Bong solo? Bongs are meant to be shared!

“Watermelon Man” by Herbie Hancock has a beer bottle solo credited to Bill Summers.

alright. So.

I gotta ask…

how high are you (were you?)

also, just to actually answer the question, if it’s played as an instrument, it’s an instrument. Anvils have been instruments (See that thing in Andor. that’s an instrument.) Saws, too. Wine glasses. (both, by playing the rim, as well as breaking them as a sort of percussive instrument.). Even your desk when you’re bored out of your skull waiting for that one email to come in so you can do your job. (rapatap tap, smack rapatap tap, thunk.)

The bong player from Cypress Hill fuckin rips

I’m something of a bong soloist myself.