This came out of a war comic from 1981. Were the readers of war comics known for their fear of jinxes?
Just sit back and imagine the thrill when NEGAJINX starts to eliminate your jinxes. Its amazing powers will make you the envy of ALL your friends and relatives.I have nothing else to add except a full-page scan of the ad. (And be sure to notice that at no time in this ad do they ever tell you exactly what this Negajinx thingy is. No, they just refer to it was a "Negajix replica".)