Why a question mark method should return the true object or the false object

the_class_that_is_true_but_never_in_the_same_way.rb

    require 'rspec/core'

    class TheClassThatIsTrueButNeverInTheSameWay
      def initialize(truthiness)
        @truthiness = truthiness
      end

      def truthy?
        @truthiness ? Time.now : false
      end
    end

    describe "the class that is true but never in the same way's truthy method" do
      context "initialized with false" do
        it "should be falsy" do
          TheClassThatIsTrueButNeverInTheSameWay.new(false).should_not be_truthy
        end
      end

      context "initialized with true" do
        it "should be truthy" do
          TheClassThatIsTrueButNeverInTheSameWay.new(true).should be_truthy
        end

        it "should not be the same truthy for different objects" do
          never_the_same_way_1 = TheClassThatIsTrueButNeverInTheSameWay.new(true)
          never_the_same_way_2 = TheClassThatIsTrueButNeverInTheSameWay.new(true)
          never_the_same_way_1.truthy?.should_not == never_the_same_way_2.truthy?
        end
      end
    end