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Phil Lord and Christopher Miller's reboot of the bafflingly well-liked 1980s police/high school drama 21 Jump Street impressively manages to be self-aware without grating on the nerves.

The original show was the first to put the FOX network on the map and was integral in launching Johnny Depp's career both as a teen idol and a serious actor. Shortly after leaving the show in 1990, he was quickly headlining major motion pictures.

Any audience assumed a film as self-aware as the reboot would have its original lead cameo at some point. After all, he granted similar thanks by appearing briefly in Freddy's Dead: The Final Nightmare (Wes Craven's first Elm Street was his "and introducing" credit). As 21 Jump Street comes to an end, we get our Depp appearance - only it wasn't a cameo. Lord and Miller pulled the rug under audiences by revealing he had been there the entire time, under heavy prosthetic make-up, playing the same character he did on the show.

Depp gladly appeared unbilled, as revealing his name in the credits or press would ruin the joke.