is that a battery on your back, or are you displeased to see me

Have a look at the photos on Is Bush wired?

Many viewers thus saw a squarish bulge the size of a large battery pack under the back of Bush's suit jacket, with an S-shaped cord appearing to snake up the right side of his back.

There was a Robert Heinlein novel, The Puppet Masters, about aliens that clung to people's backs & took them over. & in the episode of Doctor Who I watched last evening - the Australian public broadcaster has been re-running every single one of the zillion episodes of the series; tonight we change Doctors to Tom Baker, my favourite - spiders from the planet Metabelis Three take people over in the same way once they've been transported to Earth by means of the mystical magical mantra Om Mani Padme Hum, the jewel lies in the lotus. Or was it the vibrator envigorates the vertabrae?