Best When?

Overheard at our house...
Blond Twin:  "Did you get this at Best Buy?"
Mom:  "Did we get what at Best Buy?"
Blond Twin:  "The honey."
Mom:  "Why would we buy honey at Best Buy?"
Blond Twin:  "On the back it says best by."
Mom (laughing):  "No baby, that means it tastes best before that date.  It's not buy like you purchase something.  It's by like a due date."
Blond Twin:  "Ohh, that makes sense.  I thought it was funny that you'd buy honey at Best Buy."