Back in the mid 40s or early 50s the Readers Digest ran occasional short "inserts" on words people have trouble spelling, and they encouraged people to send in their candidates for publication.

I still remember the contributor (most likely a pharmacist?) who complained I just cannot teach my secretary to spell bishydroxycoumarine ... [with a list of a dozen others of similar kind, at least some of which are probably spelled differently by now].

It still amazes me that such a simple word would stick so firmly in the mind of a 7 or 8 year old kid half a century later. Maybe it qualifies for "earworm" status?

John