"You're going to fall off the bed!" she warned.
We have one of those viscoelastic foam matress toppers, and it has an annoying tendency to slide around. Lately, it's been sliding toward my side of the bed. The extra couple of inches made me completely mis-estimate how much bed I had. By the time she got her warning out, gravity had its hold.
I managed to hit fairly evenly, but I smacked my elbow pretty badly on the frame of the bed. Our bed is also rather higher than most, and, frankly, 100 kg falling a full meter packs a lotta joules.
I... hurt. All over. Not excrutiatingly bad, but tomorrow will probably not be fun.