Shockwave. Also, when Norm's elastic chainsaw is on his left hand is a reference to when Optimus replaced his right hand to a giant chainsaw. Monopoly - Doofenshmirtz mentions a "Get out of Jury Duty Free" card, like the "Get out of Jail Free" card in the board game. L.O.V.E.M.U.F.F.I.N. Pudding