The Great Kazoo's Feedback
"when you're happy you enjoy the melody but, when you're broken you understand the lyrics".
My mother sent me one years ago as a gift touting some kind of health benefit. It's hard to quantify the results other than you can smell it (like just before a thunder storm). We had a small grease fire one evening and the ozone machine seamed to take care of that odor pretty quick.
Eventually the unit burst into flames though and nearly burned my house down.