Ruby delegate.rb secrets
saturnflyer.com
saturnflyer.com
That said... the code examples in this article are exactly the patterns that were leveraged (and are still being leveraged) to exploit the recent wave of object serialization vulnerabilities via YAML/JSON/XML (including the one that popped rubygems.org recently)
see: https://groups.google.com/forum/?fromgroups=#!topic/rubyonra...
Just be super careful when using code like this, it can have very unintended consequences when you bring object remoteing into the mix.