I once realized it was trivial to dynamically load a ruby class & module on a request-by-request basis in a rack app, which invented an easy way for a group of

I once realized it was trivial to dynamically load a ruby class & module on a request-by-request basis in a rack app, which invented an easy way for a group of non-programmers to modify a rails apps views by overloading methods in a file called FooBarCom.rb where FooBarCom could be any domain the app was hosting. :-)