When I think of Jinx and the etymology of Jinx related back to withcraft. It is alot like 'pointing the bone' in the indiginous people of Australia. You can effect your enimies by Jinxing them.
jinx (n.)
1911, Amer.Eng., from 17c. jyng "a charm, a spell," originally "wryneck," a bird used in witchcraft and divination, from L. iynx "wryneck," from Gk. iynx. The verb is 1917 in Amer.Eng., from the noun.
Since I am not a believer in Witchcraft - or believing that any one person has control over others outcome - I am loathe to believe that I can jinx anyone.
Most conceptions of jixes are history related. If a sports team has lost three times when it snowed in a particular stadium they might say they were jinxed when it came to playing the snow. If this cintinues for some time they might even give it a name and call it a curse. A curse seems to be a strong jinx.
curse
O.E. curs "a prayer that evil or harm befall one," of uncertain origin, perhaps O.Fr. curuz "anger," or L. cursus "course." Connection with cross is unlikely. No similar word exists in Gmc., Romance, or Celtic. Meaning "to swear profanely" is from c.1230. Curses as a histrionic exclamation is from 1885. The curse "menstruation" is from 1930.
In my opinion jinxes and curses are cases of manifest destiny.
Unless the posters above are thinking something else - I guess they work witchcraft on a daily basis and I shouldn't make them made - lest they jinx me!
Perhaps that is why stand up for pessimism has a black cat in his avatar...
TTF