The color purple painted on a fence post, gate or tree here in Texas means 'No Trespassing'. In fact when this Texas law was first passed in 1997, the painted post had to be accompanied with a no trespassing sign somewhere near by.

However, exactly one year later the law changed and the accompanying 'No Trespassing' sign was done away with. Today, a post, gate or tree painted with the correct shade of purple will suffice as a 'no trespassing' sign.

The above video shows you the exact shade of purple to use and how much of the post has to be painted. So, if you run across this color purple, do not cross it or you could get charged with criminal trespassing.