Smiling is infectious you can catch it like the flu.
When someone smiled at me today, I started smiling too.
I walked around the corner and someone saw me grin.
When he smiled I realized I had passed it on to him.
I thought about the smile, and then realized its worth.
A single smile like mine could travel round the earth.
So if you feel a smile begin don’t leave it undetected.
Start an epidemic and get the world infected (by Spike Milligan)