Your a fucking idiot, i can take 20,000 Volts and be fine, It'll hurt like FUCK, and theres a small chance it could stop my heart if exposed for too long.
I, personally, have taken 100 kv hand-to-hand intentionally. I was fine. Didn't hurt at all.
Then I burned a pinhead-sized hole in my finger with the arc I drew while moving the electrode away from myself. That hurt a bit more. Healed right up, though.
The PSU in question was a lamp ballast. Ultra-low current (microamps.) I was using it for a mini solderbot.
I've also accidentally touched a 300v flash capacitor. I woke up on the couch with my parents looking down at me in horror. (That was for a portable EMP cannon.)
And I've also played with a gigantic capacitor bank (megafarads!!) at 1 volt. It vaporized the electrodes.
Electricity is not some magic dangerous thing. If you understand it you can be safe with it.
(oh, and don't build your own PSU. if you fuck up you'll kill your graphics card
, possibly the mobo as well)