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There's probably a word I've been pronouncing wrong my whole life that I don't know about
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
You could record the times when you find out a new word that you've been pronouncing wrong. You should notice less and less new mispronounced words as your list of known mispronounced words gets longer and longer. If you graph the data out, you can extrapolate the curve out to infinity, and you can estimate how many total words you're mispronouncing.