This Christmas break we stayed at Tamsen's house, since their guest room has a slightly larger bed than mine does (i.e., queen vs. full). However, when we arrived at her house, we found that the frame of the bed was bent outward, leaving the bed in a bit of a U-shape. It wasn't bad enough to warrant any sort of complaint, though, so we figured that was that.
The trouble, though, is that while sleeping in the bed, one tends to roll toward the center, making things difficult for the second tenant of the bed. More than once, I woke up to find Tamsen nearly shoving me out of the bed because she'd rolled to the middle. One time, I decided to gently nudge her back to her side by bumping into her. Nothing happened, so I tried again, this time a little harder. Still nothing. Eventually, I was really throwing myself at her, over and over, which she later told me was the point where she woke up. Somewhat groggily, she made her way back over to her side of the bed, and I rolled back to mine in peace.
It all seemed like a good idea at the time, but the image of me repeatedly rolling into Tamsen at high speed thinking "MOOOOOVE" seems pretty ridiculous now.