I remember when a cleanliness-focussed friend got his first apartment and was able to wrangle an air freshener. It had a series of colored lights that would change in hue and number illuminated depending on what it perceived as the local air quality.
Said friend said that, ever since he got it, he made sure to go next to it any time he was feeling flatulent because he wanted to see whether he could influence the lights.










Allegedly. I never witnessed an attempt.