On Sun, 24 Jul 2016 18:34:11 -0700 (PDT), Pavel314 wrote:

I saw a good sign at a gun show a while back:

NO TRESPASSING
I HAVE A GUN AND A BACKHOE

These signs are all funny, and I appreciate the humor, but my question
would be whether people would take them seriously.

We want them to take the California Penal Code 602L and N seriously.

So, we'll go with the standard signs.
I noticed there are even "California" no-trespassing signs we can buy:

http://www.mysecuritysign.com/No-Tre...KU-S-7291.aspx

At $100 bucks a pop, these are a bit expensive though:
https://www.chairish.com/product/163...sspassing-sign

BTW, it's interesting that, in California, trespassing can be a felony!
http://www.shouselaw.com/trespass.html