My ginger and white does that regularly. He'll walk alongside a wall, do a kind of forward roll and end up on his back, legs splayed out, saying "Scratch me house slave"
Its great! Everyone in the household is very satisfied with it. It really does knock a lot of smells down and is way less annoying to clean up. I was probably the most skeptical, and its only about a month or so old, but it really does seem to run really well. Once we get the upstairs whipped into shape, I think we will purchase an additional one to replace the box up there (which is now scarcely used, actually). The tiger can be a bit skittish and it took him a tad longer to get used to the small noise it makes, but he's completely over it now. Its a steep price, but its somehow worth the cost haha.Yes they are.
How are you enjoying the LR?