Finally finished watching 2006/7 Saiyuuki --- mild spoiler warning ---

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At the end of the last episode, Sanzouhoushi (Tripitaka), Son Gokuu (Monkey), Sa Gojou (Sandy) and Cho Hakkai (Pigsy) escape from the baddies. Weary and beaten, they see a man sitting with his back facing towards them drinking from a big bottle of water. Gokuu begs him to give them a drink, but he ignores their pleas and continues drinking. Gokuu rushes at him, but the old man lifts the bottle causing Gokuu to trip over and fall. As Gokuu looks up, the old man is laughing at him, but the audience sees that the old man is played by Sakai Masaaki, who of course played the original Son Gokuu/Monkey from the 1978-80 "Monkey" TV series! The old man then picks up Nyoibou (Gokuu's staff) and starts spinning it around just as he did in the old show, and the original "Monkey Magic" theme song starts playing in the background! It is then revealed that the old man is actually Buddha himself, who gives them the Sacred Scrolls (the object of their long quest), and also liberates Gokuu by removing the golden ring from his head, and even remarking, "This thing really hurts, doesn't it?"

That's gotta be one of the best TV cameos evah!
Click here to watch the cameo scene!