The actors set Twitter alight on Tuesday, June 25 when they both uploaded sepia-toned photos of two donkeys in a field at the exact same time.
They simply captioned the pictures, "Soon".
Followers immediately jumped to conclusions about the mysterious posts, with many suggesting the animals were drug mules, used to promote the upcoming "Breaking Bad" movie adaptation, which began filming late last year (2018).
The project, directed by series creator Vince Gilligan, was previously said to serve as a sequel to the hit TV drama and centre on the misadventures of Paul's character Jesse Pinkman, the sidekick to Cranston's chemistry teacher-turned-drug kingpin Walter White, who appeared to die at the end of the fifth and final season back in 2013.
Despite his character's presumed death, Cranston's name was featured on a leaked movie cast list obtained by RevengeoftheFans.com in January, indicating he would be reteaming with Paul for the film, which had a working title of "Greenbrier".