ruby_caller.rb

def call_em_up_once
  puts "CALL EM UP ONCE"
  caller.each {|line| puts line}
  puts "\n"
end

call_em_up_once

class Foo
  def call_em_up_twice
    puts "CALL EM UP TWICE"
    caller.each {|line| puts line}
    puts "\n"
  end
end

Foo.new.call_em_up_twice