It took me 6 months to get PowerCor to understand the shower was trying to use me as an earth, because they couldn't reproduce it. They told me I was just being sensitive, despite every flat reporting similar issues.

The hot water pipes were being used as the earth, and the electricity could leap across the pipe in bad weather.

You are probably connected to poorly grounded socket or a socket where hot and ground were switched.

I had a grounding issue and I used to get shocked by my tower all the time, this is pretty common.

Same here, with some PCs back in a shop area. Come to find out, the outlets weren't getting a good ground due to painted conduit. And without a good ground, a cheap surge suppressor ended up dumping about 30 volts into the ground pin.