Suprised how many people have had shocks from 230v mains! In a lot of cases it will just be a "shock" and not fatal, but remember there are certainly instances when it could be fatal.
I have been shocked by 10,000v, it was from a small marx generator I was using. Was treading on some of that enamelled wire which was live and reached to disconnect the power supply, which by touching the negative connection completed the circuit. Gave a good shock, but obviously not very serious, low current only involved.
I find it wierd how you can get shocked upstairs or in a lot of places for that matter (ie, stood on vinyl kitchen floor tiles) since the earth connection must be very poor (clingfilm can insulate 230v, honestly). However, it seems you can. Linking one side of a high voltage generator to earth and touching the output will give you some shock, usually comparitively feeble, but even upstairs. That is why mains is dangerous anyhow, you never know how well you are grounded; also what path through you the current takes is important as to the damage it may do.