Ok, so I guess I'm an asshat then.. :
Heh..
However, what we learned in school (that 0.065A is the border between lethal/nonlethal) and what my multimeter tells me is my hand-to-hand electrical resistance (Mega-ohms, if I'm not mistaken) leads me to think playing with 24V is pretty safe. I=24V/1MOhm = 0,000024A That's 24microamps.. 2700x less current than what might be lethal to a healthy human.
But I might be wrong, and die from playing with a 12V transformer. Then again, I might slip and fall down some stairs, get hit by a car or quite simply try to eat the transformer whole, choke and die. Should any of the above occur, my tombstone will say "Darwinism at work. One less retard in the gene-pool." 