gistfile1.rb

class Raise    
  def self.raiser
    1.join
  end
  
  def self.the_caller
    raiser
  rescue => exception
    raise RuntimeError, "My custom message: #{exception.message}", exception.backtrace
  end
end

Raise.the_caller # => RuntimeError: My custom message: undefined method ‘join’ for 1:Fixnum