From Youtube: “What is it about laughter that’s contagious? Sometimes you just can’t stop from smiling when you hear or see it. Last September, an elderly couple from Iowa infused the internet with laughter and joy. Their random act of happiness at Mayo Clinic hit You Tube and made more than 6 million people smile. And that, say Francis and Marlow Cowan, is what keeps them young”

Here is their original You Tube hit performance: