I helped Mom flip her mattress tonight, and just as we lifted it up (end over end, not side to side), Buttercup jumped on the bed. We slid the mattress off the bed and raised it up so it was perpendicular to the floor. Buttercup climbed it as it rose, finally perching at the very top. Then we picked it up and placed the bottom of the mattress back on the bed, tilting it down the other way. Through the entire procedure, Buttercup clung and scrambled so she wouldn’t be thrown off the mattress.