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Cameos are so commonplace that they're pretty much expected. Celebrities pop up all over the place, making winky appearances that literally nobody can miss, and disappearing.
But there are also some next-level cameos that are objectively amazing. It's a famous person showing up in their own biopic. It's the director turning up to make a meta-reference about their career. Or a ridiculously famous celebrity trying to sneak in under the radar. The result is a brilliant cameo that can rightfully be called an Easter egg.