Being an actor on Game of Thrones seems like a pretty sweet gig. You get to be part of a universally beloved worldwide phenomenon and get to work with some incredibly talented people. The only real downside is that it doesn't come with a whole lot of job security.
Just ask Kristian Nairn who played Hodor for six and half seasons until (spoilers) he was killed by White Walkers in one of the most heartbreaking moments in the series. In case you have forgotten, Hodor dies while holding a door to prevent the White Walkers from getting to Bran and Meera. Thanks to time travel magic, we also learn this moment is responsible for Hodor only being able to say "Hodor" as "Hold the door" eventually gets shortened to "Hodor." It's complicated, but also pretty great.
Now Nairn is back playing Hodor, kind of. In a recent viral ad aptly named "Lunchtime is coming..." Nairn plays a KFC employee during rush hour who, instead of being swarmed by ice zombies, gets overwhelmed by a bunch of hungry people on their lunch breaks.