NO TRESPASSING

Sometimes it is what you say. (The message is CLEAR.)
Sometimes it is what you IMPLY. (Requires some INTERPRETATION.)
An example, you ask? Try this one:
"Proceed at your own risk." It's okay to go, but there is some hazard.
A perfect example of understatement. But it's CLEAR.

Another example was brought home to me a while back, by a policeman. He was in our residential complex and had peered over my patio wall. He saw my sliding glass doors, on the inside of which hung a paper target from the shooting range. The outlined figure was full of holes.
His comment was, "I like your No Trespassing sign." I nodded at his understanding of the message.
Not unclear, but merely written in smaller letters. No shouting. It's similar to the 'Proceed at your own risk' warning...only fatally so. And it requires no translation into foreign languages.
Any questions? I didn't think so.