Do you ever go "What kind of mind comes up with these things?". Well, I will expose part of what comes out of my head. Not for the faint of heart!
First you would have to be the kind of person that would want, and then acquire a cougar/mountain
lion/catamount/panther. Guilty I am.
That said, it is not much of a stretch to create the P.E.T.A. sign. Then I enlist the assistance of my friend John* to stage the scene and take the photo. The animals have learned to read and will take revenge.
What do you do for Halloween? I don't have to wait for Halloween to have fun. I get out my 'alien', mount him in the brush guard on the front of my truck and take off down the road.
A couple of years ago I drove into town to have breakfast at one of my regular haunts, 
and Tiffany and Bill came out and posed with the little 'man?'. Then I drove back and forth on the busiest streets in town getting stares, waves, thumbs up.
*He set the cougar in the woods, sent his 11 year old daughter to retrieve something he had 'dropped' and then we rushed around the other way to watch her reaction. What a hoot.
Funny Stock Aluminum Parking Signs
These are funny, 12 x 18 inch, rounded corner, stock aluminum parking
and no parking signs designed to provoke a little commentary
with various inscriptions. They are also made of highway quality
.040 aluminum and come as is, they cannot be altered.
Crossroads also makes Custom Funny Metal Street Signs, heavy steel, stock plus authentic, US route 66 State metal signs.