If there's an interest in such posts, I will write more. The idea is
that I will provide examples of lesser-known features of Ruby. Later
on, I will do a longer write-up where I will provide a solution and
explain it unless someone will do it before me :)

Let's say I have a program I can't modify:

```ruby
def gen_proc
  secret1 = rand
  secret2 = rand

  proc do
    p secret1 * secret2
    nil
  end
end

my_proc = gen_proc

binding.irb
```

It will launch an interactive Ruby console. When I type:

```ruby
my_proc.() # .() is a shortcut of .call()
```

It will print some number, but each time I will type this expression,
it will be the same number (until I relaunch the console). This number
is derived from `secret1` and `secret2` variables. Those variables are
stored somewhere - but where? What is the best way for me to obtain
values of those variables? Do note that I can't modify the code :)
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