After perusing the grocery advertisement, I turned to Kev and said, "We should eat Mexican food on Cinco de Mayo."
K: "Sounds good to me."
A: "When is Cinco de Mayo, anyway?"
K: "May fifth. That’s what Cinco de Mayo means. Fifth of May."
A: "That’s retarded. Couldn’t they think of a better name for their holiday than that?"
K: "Um, Amy? How about our Fourth of July?"
A: "Oh. I forgot about that." [insert sheepish grin]