Cinco de Mayo

Ever say something really dumb? I have more times than I care to remember. One such was asking a question while dining at a local mexican restaurant a few years ago, and seeing a poster on the wall announcing the upcoming holiday, "Anybody know what day of the month Cinco de Mayo falls on?" Yea, really dumb question, but I never took Spanish in high school, plus I'm pretty dense at times on top of that. My question got quite a laugh by the way.