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Take 10 people and let them all stand in a circle, holding hands. Then break up the circle in one spot, and put the multimeter, on ohms resistance setting, between them, to complete the circle.
I kid you not. Provided you have a proper quality multimiter, the thing will actually pick up the signal, and calculate a resistance value, across then people put as resistors in serie...
I figure it probably has something to do with humans being just a little bit more conductive than you might think, given that they always have just a miniscule layer of moisture, with some salt in it, on top of their skin. But still, that's quite impressive...
Soo, yeah, for the meter to not pick it up, it really has to be burnt trough, and not just a really high resistance value that the meter doesn't pick up.
I think that, by the time a proper multimeter can't pick up the resistance value, you're not talking about ohms resistance anymore...