We had a facepalm moment in the cafeteria line that day.
Food service had a bunch of pie slices out, and there was a sign: 3.14, 3/14, the pi symbol, and a graphic of a slice of pie. Me and co-worker were waiting for our sandwiches to be made when this woman approached...
Her: $3.14 for a piece of pie?!?
Him: No, it is Pi Day!
Her: Pie day? Oh I get it, March 14th!
Him: No, pi as in 3.14.
Her: What? What does that have to do with pie?
Me: You know, the ratio of a circle's circumference to it diameter....
Her: You guys are smarter than me. (walks away)
After she left we had all we could do to hold back tears of laughter. Or were they tears of shame?