"Mitochondria is the powerhouse of the cell" is a common meme for being one of the few random (and possibly useless) facts one remembers from school.
https://knowyourmeme.com/memes/mitochondria-is-the-powerhous...
https://knowyourmeme.com/memes/mitochondria-is-the-powerhous...
What, really? I’ve always heard the mitochondria’s role in energy production described as established fact.