I'm just waiting for that little mouthpiece re-breather the Jedi used in the Star Wars prequels.
C'mon, Blackwood, James Bond did a mini rebreather first in Thunderball in 1966:
http://www.therebreathersite.nl/01_Informative/Images/zuurstofrebreathers/Bondrebreather.jpg
http://www.universalexports.net/Movies/Graphics/4-images/debreather.jpg
"Description: In the event of a rebreather not being available, this gadget was to be used for short times only: say five minutes. Bond used it twice: once to escape from the shark tank, then again to finish the final underwater battle."
one of my favourite UW movies.