Don't hit Rudolph Traditional Cache

A very easy park & grab, just be sure to pull all the way off the highway, and keep an eye on traffic!!

I've been laughing at this funny sign for some time now, it finally occurred to me to share it with my geofriends!
A guy at work says there's lots of signs like this. Have you ever seen one? Does anyone know how this sign came to be?
The title refers to some logs from Toot & Toot Toot, hope they don't mind!