I remember seeing my uncles cows do that exact thing when I was a kid, except the one in front(on the bottom?) touched her nose to the electric fence, poor old bull that was last in the daisy chain, his tail went stiff and he let out a bellow and jumped off...well as soon as he did the poor young bull that had been middle man as it were went rigid and let out a bellow. As he was jumping down the old cow turned to look back at him...she never felt 1 bit of current and continued chewing her cud like nothing happened....funniest thing I ever saw...