Are you smarter than a kindergartener?

So the other day, I was picking up Alex from school. He was telling me about all the new shapes he had learned. The red was a square, the blue a diamond and so on. Later, he is telling Carl about the same things. Red is a square shape, blue is a rhombus...and I'm all "wait, I thought you said that blue was the diamond?"

" Mom, a diamond is a rhombus."

"oh"

(To make things more humiliating, I wikipedia'ed rhombus to see if he was right...he was!)