Lets say you're building a drupal website for Bill's Widget Company. You create a custom theme, and a custom module. Now lets also say you are as dumb as me, and decided to name both your theme and module the same thing: bwc. Its a small mistake you'd never make if you thought for a second: "Should my module and theme share the same drupal namespace?" It sounds dangerous, even if you don't know why. Here's why it is dangerous: