Just a small chunk of code taken from a blog post at http://jameskilton.com/2009/04/02/embedding-irb-into-your-ruby-application/ (which itself was taken from the ruby-debug gem) to drop into an irb session at any point in a ruby program.
requireinternal_irb.rb somewhere in your app.IRB.start_session(binding)in your code will drop into irb immediately.
It works on my machine. ¯\(°_o)/¯