a scare
Nos diste un susto tremendo, campeona.
You gave us quite a scare, champ.
— La gran enfermedad del amor (2017)
Es mejor que esté sentado cuando le den la noticia para evitar un susto.
It's best if he's sitting down when they give him the news to avoid a shock.
It's just that you gave me a scare.
— Mujeres al borde de un ataque de nervios (1988)