I Dunno
My mom was a history teacher. She had a new student come in mid-year from Mexico. She tried giving him schoolwork assignments and called on him, but he always replied, “No se” which means “I don’t know” in Spanish.
Frustrated for weeks by that, my mom vented to the other teachers on her team about how the kid could possibly get a grade if he couldn’t speak any English. The teachers were all stunned. They informed her that the kid did indeed speak English and had just been fooling her.
Embarrassed, my mom gave him an assignment the next day, and he pulled the same stunt, “No se”. She took a giant red marker and drew a huge F on his paper that took up the whole page.
She looked him in the eye and said, “Do you comprende now”? He was an A student the rest of the year. Story credit: Reddit / Americasycho