You catch it like the flu,

When someone smiled at me today,

I started smiling too.

I passed around the corner and someone saw my grin

When he smiled I realised I'd passed it on to him.

I thought about that smile then I realised its worth,

A single smile, just like mine,

Could travel round the earth

So, if you feel a smile begin, don't leave it undetected

Let's start an epidemic quick, and get the world infected!