Don't think I've ever seen it on humans.....
saw it on a dog a few times....
wait now that I think of it , yes I did a man in line one time with 2 different colored eyes, think it was the same, blue and green thing going on..... but he was mentally and physically handicap so I didn't want to stare long
but yeah now that I think back on it, they were fascinating
still on Florence Henderson...….