I know it's a joke. I get the joke. My question is: Is it an actual photo of a real product that has been memed into a joke and what is the actual product/device used for? Ice on props is a very real problem. And based on the apparent age of the photo, I wondered if it was something used to combat ice on a prop prior to flight. As in, the chain would prohibit ice from forming and that any ice that did form would be removed when the chain was removed prior to flight.