Stray voltage from faulty wiring searches for a ground. In the case of Slabo, the most readily available ground seems to be the steel housing on his TM foot. Has the effect of a tiny arch welder working on exposed surfaces. Some voltage is always present, which is why the foot on motors have sacrificial anodes to attract the voltage, but in this case, it's excessive indicating faulty wiring or maybe a chaffed wire somewhere.

Wannabe...