supertrix.rb

class Parent
  def dope_method(arg1 = nil, arg2 = nil)
    puts "Called Parent#dope_method(#{arg1.inspect}, #{arg2.inspect})"
  end
end

class Child < Parent
  def dope_method(arg1, arg2)
    puts "Called  Child#dope_method(#{arg1.inspect}, #{arg2.inspect})"

    # No parentheses
    super
  end
end

c = Child.new
c.dope_method("arg1", "arg2")
# Called  Child#dope_method("arg1", "arg2")
# Called Parent#dope_method("arg1", "arg2")

class Child < Parent
  def dope_method(arg1, arg2)
    puts "Called  Child#dope_method(#{arg1.inspect}, #{arg2.inspect})"

    # Parentheses!
    super()
  end
end

c = Child.new
c.dope_method("arg1", "arg2")
# Called  Child#dope_method("arg1", "arg2")
# Called Parent#dope_method(nil, nil)