camosoul, you should be careful speaking in absolutes like that. They say that a little bit of knowledge is a dangerous thing, and it sounds like you're squarely in that zone.
It's true that current is what's dangerous, but without voltage, you can't generate any current. (Btw, the terms "amperage" and "condensor" were deprecated for "current" and "capacitor" decades ago.) That's like saying it's water flow that puts out a fire, not pressure....it's true as far as it goes, but without pressure, you'll never get the water to flow.
There are also a lot of other variables. A current of 5mA directly through your heart can be enough to stop it, but getting 5mA directly through your heart can be done many different ways. Applying a high voltage from one foot to another (which may happen if you're standing on the ground when a lightning bolt strikes nearby) isn't likely to get much current through your chest area, since it'll follow the shortest path through your legs, whereas applying significantly less voltage from one hand to the other may be much more likely to get a fatal amount of current through your chest. And a tesla coil is extremely unlikely to ever cause any damage in spite of high voltage, both because the current is low and the frequency is very high, which causes the current to flow almost entirely through your skin, never penetrating very deeply into your body (look up "skin effect" in wikipedia).
Okay, you may have stuck your hand in a tesla coil, and yes, it's quite amazing to see the lightning striking you and not causing any effect, not even any discomfort. Van de Graff generators are also very cool, as long as you don't step off the insulated stool. But DO NOT stick your fingers in a 220V socket, you really aren't going to like what happens if you do.
