"She had a mouth like iron, but she could not be accused of bolting, or even running away. She would just tuck in her chin until it touched her chest, drop the bit, and canter slowly, steadily and relentlessly on. The most that you could hope to do when she was in this mood was to turn her into a circle, and wait until she grew tired - unless of course you had a friend on foot who would run in and grab the bridle." (Stella Markeson - Horse Portraits, in Riding Magazine, Sept 1961)
This is of course evasion, and not at all actual rollkur, but I found it interesting to read of a horse doing something similar!