Milk.

It seems we are still (some of us) mildly intolerant of milk.
How can a PERSONALITY affect such a thing, it defies logic. Nevertheless only a fool would deny her own senses and experiences and we have TESTED ourselves repeatedly. It simply must be so.

Skink suggests train whistle causation analogy.
(ie. the whistle blows because the train is coming)
To this Manny suggests that either way it's a good idea to get off the damn tracks.