question of the day: What’s the best -- or worst -- nonactor celebrity cameo you can think of?

Perhaps you’ve heard: Bill Clinton will appear in a cameo in The Hangover 2, perhaps in a scene akin to Mike Tyson’s pop-up in The Hangover. From People.com:

Clinton, who'll play himself in the comedy, shot his brief appearance on Saturday in Bangkok, where part of the production takes place. He was in the capital city to deliver a speech on clean energy.

Ah, Bangkok. Where jokes about what does or does not constitute sex can occur in the presence of an underage prostitute who may or may not be female.

In light of this news: What’s the best -- or worst -- nonactor celebrity cameo you can think of? Or maybe this is both at the same time? (Feel free to invent potential cameos.)

(If you have a suggestion for a QOTD, feel free to email me. Responses to this QOTD sent by email will be ignored; please post your responses here.)