Blue pee water????

[polyvue]

There is, however, a genetic disease that can do that and cause mental illness at the same time. The film "The Madness of King George" is about that (also a surprisingly interesting and exciting flick about George III).

Nigel Hawthorne's performance was great in that film, wasn't it?

Whether genetic or not (see Porphyria), I would discourage jaundiced, purple-peeing swimmers from using my pool.