Signs, signs

I've been thinking a little lately about some of the signs I see.  Driving between our two residences there was a sign about a "prescribed burn" so "don't report."  The sign was out of date because there was nothing burning, but I wondered why it was "prescribed"?  The dictionary says one of the meanings of prescribed is "a rule that an action should be carried out."  So I guess the sign was saying the "burn" should occur... so I guess it did?    I have a few actions that I'd like carried out, can I prescribe something?  Would anyone care?

Another sign we chuckled about was "professional detailing" for automobiles.  Doesn't one become professional simply by receiving pay for doing something?  I think I'd like amateur detailing--much cheaper.

The most common sign that makes us laugh is "For Sale by Owner."  After all, who else has authority to sell?  I'd like to see a sign that said "For Sale by Neighbor" (to get rid of annoying dog owners) or "For Sale by Close Personal Friend" (because someone didn't repay that friendly loan).   Those would be interesting signs to read.