FactAs a matter of fact - DC is more dangerous than AC - this is because for the same resistance offerec by the body - a 100 V DC will discharge two times the current that will be dicharged by a 100V AC.
But I dont think 'your safety' was the motivation for Electric companies to send you AC to your home - this has something to do with minimizing losses in transmission.
Man....If I count the number of times i've been 'Shocked' hee! I was thrown out of the lab (even though I nearly died - nobody is sympathetic these days) for shorting the two terminals with a piece of naked wire and turning the switch on hee hee
How was I to know - I wasn in 8th grade then...
But come to think of it - i'll probably do the same thing today if I had the nerve - it felt sorta cool getting all electrocuted
Disclaimer : If you connect the ground wire to the bathtub or faucet - at least let your friendly roommate know Might save you the cost of buying a casket or even worse - a bottle to mail him back home hee hee