This dual-ended cellphone power connector from Korea seems a bit weird. You plug one end into a cellphone that's run out of power, and the other end into a cellphone full-up on juice. Once you hook it up, the downed phone will draw current from the other phone to immediately power it up.
Other than the possible problems with drawing current the wrong way through a cellphone, there's the practicality of it. If your phone is dead, wouldn't it be better to carry around a portable AA charger, or even a spare battery, instead hoping your girlfriend's cellphone is juiced up enough to jump yours?
First aid medicine(?) for handset [AVING via ]