Mariachi band serenades left-field seats at O.co Coliseum

There are so many reasons to enjoy an afternoon at the local ballpark: a fun game, great food, the company of friends and family. But sometimes, the best reasons are left unexplained or are discovered by surprise -- like, for example, this mariachi band out in the left-field seats at O.co Coliseum in Oakland:

Who wouldn't want to have a mariachi band lead their section in song? Isn't that way better than the wave? And look, they're even color coordinated to support the hometown Athletics.

Plus, it turns out the support worked: the A's beat the Mariners 6-1.