Besides obviously sticking an output of 5V directly to the heart. Are there areas inside the body where resistance in ohms is so low that a 5V electric potential would be fatal?
I got into an argument about this with my roommate after he made a joke about sticking an lightning apple lightning cable directly up his urethra. I told him that his brilliant idea could cause a nasty shock since internal body resistance is so low. He, however, insisted that the lowest internal body resistance still sits at a few hundred ohms and 5V (5V 2.1A Charger) would not suffice to provide a dangerous current.
Would it be possible for internal resistance in this area to be so low that even 5V or less would be dangerous? Say it took a path up the bladder and through the kidneys and to the heart.