Ah, the yawn
How strange
Yet peculiarly wonderful
Such an odd quirk of evolution
I have to ponder
What circumstances caused this reaction to develop
In some distant past epoch
Were yawns different
Than we know today
Was there a time when we did not yawn at all
And it was merely an adaptation
That took on a memetic life of its own
And through those glorious mirror neurons
Spread to all creatures
Until it became ubiquitous

How it makes one wonder
How the yawn conquered the world.