Smiling is contagious,

You catch it like the flu.

When a person smiled at me today,

I began to smile too.

I passed around the corner,

And a man saw my grin.

When he smiled I realized,

I'd passed it on to him.

I contemplated that smile,

then realized it's worth.

A single smile, just like mine,

Could travel round the earth.

So, if you feel a smile start,

Don't leave it undetected.

Let's start an epidemic quick,

And get the whole world infected!