Parenting fail on my part

On the way home today Caleb and I followed a guy who had a rubber duck on the roof of his car. I turned to Caleb and said “maybe it’s Ernie”.

He looked at me with a ‘what are you talking about?’ face.

I started singing “Rubber ducky, you’re the one. You make bath time lots of fun… you know, Bert and Ernie?”.

He says “Who’s Bert and Ernie?”

I think I’ve failed somehow as a parent here.