Back in the 90's I was on packet - 144.675 MHz, the 10W output from my radio ran into a BNC T-splitter (my antenna cable wasn't long enough, so I used the t-splitter as a pass through with another cable on it - and everything would fit into my desk setup neatly).
One day I had to move something around below my table, where the t-splitter was located. When I grabbed the connector to move it, my TNC-2c decided to send a packet - while my thumb was touching the BNC male end. My finger felt like a nail suddenly had been hammered into it. (I knew what had happened instantly, as I heard the relay click and knew it was on TX - into 50 ohm, but the cable was quite long, and RG-58 - so I wonder what impedance my finger had, and what was offloaded into the antenna)
After a day or so, I had a really sore and hurtful white spot in the center of a ring - naturally fitting the end size of the BNC connector. It took a looong time to heal, and i remember at one point being able to pull out a piece of white dead flesh at the center.
On a different note, I was repairing TV's at that time. One day the cable going into the high voltage transformer broke off the stud we used to insert into the transformer. (Easy insert/removal - as the standard connection is just a wire, not good for a module repair station)
The end was exposed, and naturally it broke off right when I touched it - leaving my right finger in such close proximity that I could see a blue glowing halo around my fingertip. 15625 Hz, 27kV (as I remember) feels not quite fun. I could move my arm away, and did so very fast. It didn't hurt as much, but it's surely something I wouldn't recommend. (It was pure AC, as the tube was disconnected - a huge nasty capacitor that zaps - and that hurts too, I know...)
Other things that hurts when fixing tv's and not being lucky touching insulated items 100% of the time:
Touching the 1200V vertical line deflection yoke circuit feels like it kind of snerrs, or saws - as it is a saw tooth signal (at 50 Hz here in Europe). It stuns your arm for a while (minutes), and the few times I was so unfortunate, I was sweating tons afterwards.
Touching the 300Vdc capacitor contracts muscles while the capacitor de-energizes. It is amazing how much muscles can contract, and the feeling when discharging makes you aware how your muscles react. I have never touched 300Vdc live, it was always off net - and I was stuck until the voltage was low enough to 'get away' - it might have been a mind trick, and time seemed to go very slow for an instant. Anyways, it is not recommended - and I'm happy to report that it's been a long while since I last touched something I later would rather have not.
In any case - use your mind before you use your hand - something I have learned, and used since.
- also having one hand in your pocket (or elsewhere, not touching ground or other conductive materials) is a super good idea.