What phrase or saying have you heard all of your life, and are amazed to find a whole generation that doesn't know what it means?

At a family barbque I asked everyone if they knew what was meant in the phrase “You can’t catch me ‘cause the rabbit done died!” in Aerosmith’s song “Sweet Emotion.”
Only two people knew, and they were my age. The younger ones didn’t have a clue. Just sang the words because they were there!