In all seriousness, I believe I've heard of people who are able to use their reserve battery packs in an electric vehicle, all the way from a golf cart on up, as emergency power supplies for their homes in the case of the grid going down. It's really a pretty big reserve compared to having nothing at all. That doesn't really provide for any recharging of the pack once it's gone, but I could see how it might be a short term backup plan for a power outage. It's not likely to go farther than a day or two, but hey, a day or two might matter.
Just a thought. I'm not gonna go looking for a Tesla or Leaf for that specific purpose, but it's just another little something I'd certainly be thinkin' about if I already owned one.
Honestly, as I consider whether I might like to have a golf cart for just putzin' around the place, I sorta kinda have that in the back of my mind. I also know of a few golf carts that have been set up with a couple of nice sized solar panels that function as their "roof". It would certainly make for shade on some of those hot days.
Don't know how practical any of it is but it is fun to think about.