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The Rainbow-inator is the invention that Phineas and Ferb build when they find out that Isabella hasn't seen a rainbow before ("Hail Doofania!"). However, it is later revealed that Isabella hasn't seen a unicorn before, not a rainbow. The Rainbow-inator uses the same style as most of Doofenshmirtz's Schemes and Inventions, as they both have the "-inator" suffix and they both have a self destruct button. In the same episode, Doofenshmirtz ironically builds his own "country", something that Phineas and Ferb would be expected to do.
Shooting Star Milkshake Bar