When you shoot a gun into space, on a shuttle that is currently moving, the projectile flies back into the shuttle, as it's speed is not relative to the shuttle.
Reproduction
Demonstration is made better by shooting something explosive like an RPG, as you can clearly see where the projectile landed.
Additional context
Shiptest literally impossible because of this.
https://user-images.githubusercontent.com/44201461/205448180-fd1e8e88-e230-42c3-8314-cb9554b31f22.mp4