When Chloe started having accidents, she didn't limit her activities to the area by the litter boxes. She also peed on the rug. It's been rolled up and leaned against a wall for over a month now, until we can get the salvage company out to pick it up. We need to be home to get that done.
When we are gone, the cats get bored. And when cats get bored, even super heavy rugs aren't immune from their attention. So they knock the rug over. I really don't know how they do it, the rug weighs a lot and I can't move it alone. But they manage to do it just fine; this is the second time they've knocked it over.
Right now it's on the floor and the boys have decided it makes a great place to loll about or take a snooze. If one of them isn't on my lap, then he's on that rug.