Here's a riddle I wrote a long time ago. It is wanting, but still kind of fun:
Only one man I know
Has no skeleton at all
And he can’t really stand on his own
He is six and a half
Maybe seven feet tall
And he’s always been truly full-grown
He’s got no room for skin
Wears a hat on his head
And he’s not known for changing his clothes
He’s not bronze, he’s not brass
He’s not living or dead...
So then who is this man? Who knows?