Today's prompt: Travel a while on The Phrase Finder website until you find the phrase or phrase origin that most interests you. Take some notes, do a free-write or three, and see where a little word exploration takes you.
They say he has mercury in his mind,
Affecting his judgement,
Changing him every day.
The hats started some time ago,
At first they were a welcome distraction
From his rambling ideas,
Something to focus on.
A black trilby, a grey fedora,
A brown bowler soon followed.
Smart, classic choices
But then they changed.
A blue velvet top hat appeared,
Next, a red fez with a feather on top,
Worn at a jaunty angle.
Their distractions were no longer welcome.
The pretty pink straw boater
Was the last straw, they say,
And now his hats are said,
To be mad as his mind.