With his birthday approaching, Oliver (Eddie Albert) is amused that Lisa (Eva Gabor) is preparing for some "big event" that she won't tell him about. Naturally, Oliver thinks that a surprise party will be staged in his honor. Comes the big day, and Oliver is certainly surprised -- the gala birthday celebration is for Arnold the pig! This was the final episode of Green Acres' fifth season. ~ Hal Erickson, Rovi