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 somone saw my grin,

when he smiled I realized,

I'd passed it on to him.

I thought about that smile,

then realized all it's 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!