It read ‘Stable Manure.’
My first thoughts were ‘stable manure? As opposed to unstable manure? How dangerous or explosive is this manure?’
Sometimes signs can mean something different from what was intended.
And it is important that the words used in a sign reflect their true meaning.
If not, the words can become unintentionally humorous, insulting or baffling.
Whenever I’m writing I take care to use words that cannot be misinterpreted.
Otherwise I end up with ‘unstable manure’.