Smiling is infectious, you 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 realised I had passed it on to him

I thought about the smile and then realised 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 quick and get the world infected.