haha, yeah, both my cats have done that.
Abby likes to lay on the 3/4 wall. Well it's more than 3/4 it's about a foot from the ceiling. She sometimes likes to lay where the two walls meet. One time she was so sound asleep that she rolled over and right off the wall and in the process broke my sconce shade on the light on the wall. The bad thing is I rent and I have to replace it. She's also rolled out of bed. But I think I had a hand in that, lol. I have a waterbed and it's possible that she was "bounced" out when I rolled over and caused a wave, lol
Chynna has rolled off the bed and the table. One time when she rolled off the table she landed funny and hurt her front leg
It wasn't broken or anything, just sprained. She limped around a bit for a few weeks and then was her old self again. Now she tends to not lay on the table and prefers to lay on things somewhat closer to the ground unless I'm near her.