In ***[Star Trek V: The Final Frontier][1]***, Sybok captures the Enterprise and confines Kirk, Spock and Bones to the brig.

Inside the brig there is sign on the wall in the background that reads 

>"Do not use while in spacedock"

Although at this point its not clear what the sign relates to.  

Shortly afterward, Kirk [pushes a square metal button under the sign and a seat slides out of the wall.][2]

Why exactly are they not allowed to use this seat while in a spacedock? What could possibly happen?

[![enter image description here][3]][3]


  [1]: http://www.imdb.com/title/tt0098382/
  [2]: https://www.youtube.com/watch?v=I8NRGSWYdP8&feature=youtu.be&t=34s
  [3]: https://i.sstatic.net/95wwf.png