You know how tarps stretched across fences will often have holes cut in them to allow the wind to pass through, rather than turning them into sails? This fence around a construction site had half-circles cut into each segment. Someone with a sense of humor had altered several panels, though:

Which brings me to this sign spotted on the ring road at UC Irvine a few months ago:

My best guess was "No bored vampires," but that didn’t seem likely. After walking to the other side, it became a bit more clear:

Aha! No skateboarding! Though it could easily be "No flat dollies."