Some interesting stuff [it's commentary and outtakes, not research itself, and I didn't check any reliability.] might be worth chatting about. This quote [lightly edited] made me laugh all the way through my lunch:
The Penn researchers give the example of brief contact with a cockroach, which ‘will usually render a delicious meal inedible’, ‘The inverse phenomenon – rendering a pile of cockroaches on a platter edible by contact with one’s favourite food – is unheard of. What could you touch to that food to make it desirable to eat – what is the anti-cockroach? Nothing!’
aeon.co/magazine/psychology/humans-are-wired-for-negativity-for-good-or-ill/?curator=MediaREDEF
Or, I'm an optimist in some ways, but a pessimistic one. 