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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.
Oxford English dictionary gives both pronunciations, your teacher is just a dick https://www.oed.com/dictionary/data_n?tab=factsheet#219838686 - it's like my ex who always gave me a hard time for saying "ant" instead of "ahnt."