Surprising Times Celebs Were Cast As An Inside Joke

So one of the most beautiful things that a show can do is shout out to other shows.

Inside jokes are best when you feel like someone made a shout out to you.

They're also funny in real life. In fact, I hope to be part of an inside joke someday. God, I'm so lonely.

ANYWAY, here are all the times when casting was an inside joke like...

1. The two main characters from Fraiser ended up in an episode of The Simpsons where they also played brothers who have a stupid rivalry.

Sideshow Bob's brother was Sideshow Cecil.

2. Antonio Banderas playing an animal version of Zorro in Shrek 2. Technically he was Puss in Boots.

His first major starring role was Zorro in 1998's The Mask Of Zorro.

3. The Rock showing up in Star Trek: Voyager.

In 2000, UPN arranged a tie-in with the then-WWF and the network's second-biggest property: Star Trek: Voyager. The Rock even does the People's Eyebrow in the episode.

4. Micheal Keaton playing an actor trying to get out of his famous superhero character's shadow in Birdman.

Michael Keaton was DC's first modern Batman in 1989.

HE IS BATMAN!

5. Former Star Trek captain William Shatner played the Big Giant Head in 3rd Rock from the Sun.

The show was based on aliens masquerading as humans and the actor played their egotistical boss.

6. Dean Cain and Helen Slater were cast in CW's TV show, Supergirl as her human parents.

Both of these actors have played Superman and Supergirl respectively.

7. Director Martin Scorsese showed up in Shark's Tale as an underwater creature with big bushy eyebrows.

8. Fred Savage and Jason Harvey were brothers on The Wonder Years

They show up as superhero brothers Hawk and Dove in Justice League Unlimited.

9. Colin Firth played Mr. Darcy in the BBC's Pride and Prejudice miniseries and shows up as Bridget Jones's love interest in Bridget Jones’s Diary.

Nice.

10. Christopher Lloyd played Doc Brown in Back To The Future and shows up as a mentor to Michael J. Fox's deputy Mayor character on Spin City!

11. R. Lee Ermey was a REAL United States Marine Corps staff sergeant.

He played a drill sergeant in Full Metal Jacket and was a toy solider in Toy Story.

12. Arrested Development makes numerous references to Happy Days and Scott Baio (Chachi) and Henry Winkler who played The Fonz are on the show.

13. Deadpool was full of inside jokes.

Ryan Reynolds played Green Lantern in that horrible DC CGI nightmare and that was aknowledged in the intro to the movie via a card with a man wearing a Green Lantern outfit. Reynolds also played a version of Deadpool in that terrible Wolverine movie. Ironically the scene that acknowledges that version of the character starts with the line "How could things get any worse?"

COMMENT and tell us if you knew these inside jokes.