What is your favourite Spanish word? Why?

منذ ٦ أعوام

Mine is "Merienda". It refers to a light meal we have in the afternoon here in Argentina. I usually eat medialunas (argentinian croissants) or an alfajor (the best sweet in the world) with coffee. I like the word because this is my favourite part of the day.
We also have the verb "merendar", that means eat merienda.

What's yours?