As Vegemite-ers know, there's absolutely no point discussing Vegemite with those from overseas, especially Americans, let alone trying to get them to taste it. It's a total waste of time! What's more it's potentially risky—a foreigner could likely file assault charges on grounds of attempted poisoning.
For the record, I'll eat spoonfuls of the stuff and others around me have been known to hide it away save there being none left. Recently, I've taken to the salt reduced version and I actually rather like it (and I suppose 40% salt reduction is a good thing).
Quite some years ago a relative of mine who's living in the US packed eight of the largest jars made to stockpile in his Vegemite-forsaken adopted homeland and apparently US Customs started prodding the jars looking for illicit substances. From what I can gather he wasn't arrested nor were the jars confiscated.