Someone tried that at my office and was actually told by management that they weren't allowed to have it, as there was a concern that if she were to fall off it

Someone tried that at my office and was actually told by management that they weren't allowed to have it, as there was a concern that if she were to fall off it and hurt herself, she would sue the office. Strangely, her counter-argument that it's no more ridiculous to think that she would sue for spinal problems relating to sitting in the standard provided office chair wasn't given much attention.