What are the most memorable "David vs. Goliath" football wins in Latin American history?

Hello everyone.

I'm curious to know what you think are the most unforgettable "David vs. Goliath" moments in Latin American football history. Matches where an underdog team shocked a giant, whether at the club or national team level.

Some examples could be historic upsets in World Cups, Copa América, Copa Libertadores, or domestic leagues. Which ones stand out the most to you, and why?

Thanks for your responses.