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 spaceport"

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

Shortly afterward, Kirk pushes a round metal button under the sign and a seat slides out of the wall.

Why exactly are they not allowed to use this seat while in spaceport? What could possibly happen?  Sorry I couldn't find an image of this sign.


  [1]: http://www.imdb.com/title/tt0098382/