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rule of the four-leaved clover
(discuss.tchncs.de)
Other example would be "all men have penis". Accusing someone for "faking their identity".
"I am annoyed when people correct me for using casual language. Doing so is stupid. Language isn't static. The purpose of language is to be understood, so as long as you understood me, I did it 'correctly'. Here is an analogy using plants."