Sure! More than a few people will go in asking for extra wasabi because it is 'good for their memory'. Ethical restaurants will have to explain that a majority of wasabi (at least in the US) is actually horseradish. I have little doubt they will be happy with that answer ("you're scamming us!")
I wonder how much 6-MSITC horseradish contains. Same family of plant (Brassicaceae).
[Edit] According to this business's site, not much (how factual their marketing copy is, I have no idea):
"Tube wasabi offers very little functionality Hexaraphane can be efficiently ingested when roots of raw wasabi are grated. With room-temperature type tube wasabi, little 6 - Methylsulfinyl hexyl isothiocyanate (Hexaraphane(6-MSITC)) is consumed because other ingredients such as horseradish, preservatives, and additives are included with the wasabi."
