Alex Jordan, a grad student at Stanford, came up with the idea of asking people to make moral judgments while he secretly tripped their disgust alarms. He stood at a pedestrian intersection on the Stanford campus and asked passersby to fill out a short survey. It asked people to make judgments about four controversial issues, such as marriage between first cousins, or a film studio’s decision to release a documentary with a director who had tricked some people into being interviewed. Alex stood right next to a trash can he had emptied. Before he recruited each subject, he put a new plastic liner into the metal can. Before half of the people walked up (and before they could see him), he sprayed the fart spray twice into the bag, which “perfumed” the whole intersection for a few minutes. Before other recruitments, he left the empty bag unsprayed. Sure enough, people made harsher judgments when they were breathing in foul air

-- The Righteous Mind Ch 3, Jonathan Haidt

I wonder if anyone who needs to make important judgments a lot makes an actual effort to maintain affective hygiene. It seems like a really good idea, but poor signalling.