The classic pregnancy mix-up

Embarazada

em-bah-rah-THAH-dah — Pregnant — NOT "embarrassed"

"Mi hermana está embarazada de seis meses."
My sister is six months pregnant.

This is probably the most famous false friend in Spanish — "embarrassed" is "avergonzado/a." Mixing these up has caused more than one classic misunderstanding.

"I've watched this exact mix-up happen live in a lesson, and the look on the student's face is unforgettable."— Graciela