Bob Boyce, who has invented a super-efficient electrolysis method, as well as a self-looping electrical circuit capable of charging batteries, discovered a microchip implant in his shoulder when having a tumor removed from that spot, which metastasized. It turns out the chip was made by VeriChip; and he has no idea how it got there.

Full article/source - http://pesn.com/2009/11/28/9501591_Bob_Boyce_cancer_by_Verichip/