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> As a side note, I ran across something that suggests "off of" is primarily American slang ("Get offa me!") and not particularly used in other English-speaking areas. Probably the difficulty of finding a more solid reason why it's grammatically incorrect is why it's gradually been showing up in more formal writing.

I find myself using offa and gonna, probably because they are incorrect. Or maybe it's because I sometimes speak in regional dialect. Sometimes I say he word "hollow" as if it was "holler." If it refers to a small valley, I say it that way, but if referring to a tree with the inside rotted out, I say it correctly.

I've mention this on here before, but a place with a stage for live performances is always "theatre" for me, but if it is a place where films are seen, I go with "theater." I even pronounce them a little differently.
Howard