Getting someone's attention, politely

Oye

OH-yeh — Hey / listen

"Oye, ¿tienes un minuto?"
Hey, do you have a minute?

Used constantly to open a sentence or grab attention — it's not rude in the right tone, it's the Spanish equivalent of tapping someone on the shoulder verbally.

"I catch myself saying this to my cat. It just slips out."— Graciela