What needs to happen is all passengers can take on spray-can bull horns and keep yer trigger finger on it.
Any passenger Achmed-ish so much as peeps, the entire cabin deploys the sound while the guy behind him gives him the piano-wire treatment.
Pilot cabin wouldn’t be alarmed by it, what with the door thickness.
Spray can, are you kidding, they wouldn’t let me bring home a candle from Bozeman to CT. The inspectors removed my candle and when I went through the same candle was for sale in the shop!!