Spanish people...in the mall!

Last time we went shopping I was with my mom and my sisters and we saw a couple Mexicans. They were talking really fast but i decided to listen and try to figure out what they were saying. I couldn't really understand it because they were talking way to fast for me. It was weird to actually hear people talk so fast and for the other person to understand what they are saying but I guess it's easy for them because they talk like that all the time. Whenever I would try and listen they just kept on talking way to fast. I understood some little words but not much.