We made a parking sign a couple years ago that said something along the lines of "No parking - This is not a drop-off zone, unattended children will be eaten" or something like that.
Customer had lazy soccer moms dropping off their kids in his private lot every day, and got fed up. He had a funny sense of humor and the whole thing was (obviously) a joke, but it made the news and everything. Karens all over town were quite upset about it. We ended up taking it down so Karen wouldn't get upset when she continued to use his lot for drop-offs, and replaced it with the usual "you will get towed" sign.
We've done several variations, but the bottom line always reads something like....... Violators Will Be Shot.
I made one for my dad about 40 years ago with a guy smoking a pipe letting his dog make a poo-poo with a quivering pile of sh!t. Had a big red no NO circle with a line through it and at the bottom it said. Person will be shot. Not quite sure how I worded that one.