Actually, it’s the volts and amps both, You can grab both posts of an auto battery, which has 700 or so amps, but only 12 volts, and you won’t even feel it unless you are wet,and then it will be a minor shock. A welding machine with 40 volts and 300 amps available stings pretty good, especially if you are wet. 110 volts and only a few amps can be lethal if all the conditions are right. Spark plug wire voltage is way up, 30,000+, but at only milliamperes will only give you an uncomfortable shock,mostly not dangerous,but may make you bump your head on the hood of your car:). Overhead powerlines here are about 7200 volts, and enough amps to crispy fry you if you get between one of those and a sufficient ground connection.
I got caught in a storm in Galveston bay. After my boat was beached, I tried to unhook the battery which was under water. There was no way! The shock from that 12 volt battery was just too strong.
Also the Merck manual states that for AC, 60 ma can be fatal.
cmon it was a joke! sheesh