The local branch of Wickes (DIY) had a burger caravan on a bit of concrete between the car park and a field next door. The burgers were good, and they did a superb 'breakfast-in a-loaf' that appealed to a greedy bastard like me. Occasionally, we'd have breakfast there, sitting in the car if getting DIY stuff.
One day, it came to pass that I was scoffing my loaf and the delicate one, a bacon baguette, when we noticed a procession of fat rats hopping up from under the 'van and into somewhere in the chassis.
I got a free half of bacon butty that day*, and we didn't visit again.
*Did I mention that I can be a greedy bastard, with a strong stomach (25 years of her cooking).