1_method_missing.rb

class Drink
  def sip
    puts "You drank with caution"
  end
end

class Coffee < Drink
  def method_missing(method_name, *args, &block)
    if method_name == :gulp
      puts "Please don't gulp your coffee!"
      sip
    else
      super 
      # this will do the normal thing of raising an exception that the method wasn't found
    end
  end
end

class Water < Drink
  def gulp
    puts "You drank the water with reckless abandon!"
  end
end

2_output.log

# Output:

> coffee = Coffee.new
=> #<Coffee:0x00007ffd5509ac18>
irb(main):039:0> coffee.gulp

Please don't gulp your coffee!
You drank with caution

=> nil

> coffee.eat
Traceback (most recent call last):
        3: from /Users/joemsak/.asdf/installs/ruby/2.5.1/bin/irb:11:in `<main>'
        2: from (irb):40
        1: from (irb):32:in `method_missing'
NoMethodError (undefined method `eat' for #<Coffee:0x00007ffd5509ac18>)