Our final challenge is a ranking test: five olive oils of differing degrees of bitterness. This proves a challenge for me, as I would not have described any of them as bitter. All around me, people make sounds like ill-mannered soup-eaters, aerating the oils to free the aromatic gases. I'm doing a mnyeh-mnyeh-mnyeh Bugs Bunny thing with my tongue, but it's not helping. Well before the test period ends, I stop. I do something I've never done in my entire overachieving life. I give up and guess. I do this partly at the behest of my stomach, which is struggling to cope with the unusual delivery of a sizable amount of straight olive oil.