Smiling is infectious, 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 realized I'd passed it on to him. 

I thought about that smile then I realized 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.