I apologize if someone already thought of this, but I was thinking of
Ranma crossovers that should never be done, and I suddenly had a truly
horrifying thought, worse than a Ranma/Urotsukidoji crossover.  Imagine a
truly awful curse such that when Ranma is hit by cold water he turns into
Nurse Angel Ririka. Oh the humanity. 

                                                                          dml