In the lm Batman Begins (2005) an evil organisation (the League of Shadows) successfully attempt to retrieve an experimental microwave emitter from Wayne Enterprises. This emitter is said to be used to vapourise large bodies of water using only microwaves, and the League of Shadows plan on vapourising Gotham's water supply. Here we discuss the energy and power required vapourise Gotham's water supply; 1.18 petajoules and 13.7 gigawatts respectively, as well as the isotropic electric and magnetic elds produced; 3.96*10^9 NC^-1 and 13.1 T respectively