I had a friend in college whose parents were both Jewish, but neither were practicing Jews. I don't think either one cared a bit about religion in general, or Judaism in particular. My friend grew up in Southern California, where there are probably half as many Jews as there are in Israel, so she and her sister were (sort of) exposed to Jewish culture.
One fine fall day, my friend's father and sister went to the supermarket to do the grocery shopping. My friend's father was apparently annoyed by the signs and displays in the grocery store. He turned to the sister and said "Why the heck does this store have New Year's signs up? It's September for goodness sake. We haven't even had Halloween or Thanksgiving yet."
The sister replied "Uh, Dad, it's Rosh Hashanah."
Her dad responded with the ever useful "Oh."
Happy New Year and L'shana Tova to those who celebrate it. We're having apples and honey today. And I even took the day off.