Recorded music playback that once started can't be stopped
press 'play' by closing the safe door 
UL safe ratings as in
(TX|TR)TL-'net working time in minutes'(x'number of faces rated')
fail-deadly constructions
(Clark Ashton Smith's idols in narcotic metals)
Safe dial movements designed as a message to the cracksman, hypnotically reprogramming his heart.
storage for anticommunications from BrĂ¼n