I think I saw this behavior in a funny cat youtube video where the cat arches its back and runs sideways in a weird way, and in the youtube comments it was explained that this wasn't funny - it was a disease.
Well, maybe this is nothing, but I have a 2-3 month old kitten that did what looked like the same thing. It was very weird and didn't look calculated.
It arched its back and ran sideways into the wall and furniture a few times, for no reason.
Is that a symptom of some disease?
I'll be taking the kitten to the vet today, was just asking for perhaps a quick answer.