I hadn't, until I came across this article at Lapham's Quarterly.
Lacking performance-enhancing drugs, ancient Olympians turned to sorcery to gain an unfair competitive advantage. Athletes visited professional scribes to commission curse tablets, which needed to be buried within the sports arena to benefit from the utmost magical efficiency ... The Persian general Chosroes supported the “Green” chariot team and had this spell created against Roman emperor Justinian’s favorite “Blue” team:
Most holy Lord Charakteres, tie up, bind the feet, the hands, the sinews, the eyes, the knees, the courage, the leaps, the whip, the victory and the crowning of Porphuras and Hapsicrates, who are in the middle left, as well as his codrivers of the Blue colors in the stable of Eugenius. From this very hour, from today, may they not eat or drink or sleep; instead, from the starting gates, may they see daimones of those who have died prematurely, spirits of those who have died violently, and the fire of Hephaestus. In the hippodrome at the moment when they are about to compete may they not squeeze over, may they not collide, may they not extend, may they not force us out, may they not overtake, may they not break off in a new direction for the entire day when they are about to race. May they be broken, may they be dragged on the ground, may they be destroyed by Topos and by Zablas. Now, now, quickly, quickly!
There's more at the link.
According to Wikipedia:
A curse tablet ... is a type of curse found throughout the Greco-Roman world, in which someone would ask the gods, place spirits, or the deceased to perform an action on a person or object, or otherwise compel the subject of the curse.
These texts were typically scratched on very thin sheets of lead in tiny letters, then often rolled, folded, or pierced with nails. These bound tablets were then usually placed beneath the ground: either buried in graves or tombs, thrown into wells or pools, sequestered in underground sanctuaries, or nailed to the walls of temples. Tablets were also used for love spells and, when used in this manner they were placed inside the home of the desired target.
. . .
The texts on curse tablets are typically addressed to infernal or liminal gods such as Pluto, Charon, Hecate, and Persephone, sometimes via the mediation of a dead person (probably the corpse in whose grave the tablet was deposited). Some texts do not invoke the gods, however, but merely list the targets of the curse, the crimes or conditions upon which the curse is valid, and/or the intended ill to befall them. Some tablets are inscribed with nothing more than the names of the targets, leading to the supposition that an oral spell may have accompanied the manufacture of the curse.
Again, more at the link. You'll find plenty of links to more information about curse tablets here.
Hmmm . . . I was the 'victim' ('target' would be a better word, I suppose) of a death curse when I worked as a prison chaplain. I described the incident in my memoir of those years.
It involved a self-proclaimed Satanist and ‘warlock’. He tried to wheedle me into arranging a number of special privileges for him. I refused, of course — there were no circumstances under which I could justify them. He wouldn’t take no for an answer, and tried threats. Those didn’t work either. (When you’ve been threatened by experts, you get used to it very quickly — and he was no expert!) Frustrated, he finally promised he was going to see to it that I was ‘sorted out’. I took this to mean that he would arrange for some inmates to assault me when I was on the compound. I discussed it with the authorities, who tightened up surveillance, and we waited.
It didn’t take long for word to reach us through informers. He’d bragged to others on the compound that he’d cast a ‘death spell’ upon me. He confidently prophesied that I’d be dead within thirty days. I grinned, and carried on as normal. As time passed, his predictions grew louder (and more desperate) as I continued to portray the picture of good health whenever I came to the prison. (I took care to walk around openly, to demonstrate the fact.) As the deadline approached he became frantic, and tried to bribe a prison gang to attack me. Unfortunately for him, gang leaders knew all too well that visiting Chaplains such as myself were their lifeline in the event of family problems. Some of them had needed such assistance in the past. They passed the word that any attack on any Chaplain, visitor or otherwise, would meet with their vigorous and extreme displeasure. The inmates got the message loud and clear. The attempt fizzled, the deadline passed, and I was still alive.
This curse-casting cretin now had problems of his own. Not only had his credibility been shattered by my selfish refusal to fall down dead, but certain over-credulous inmates had taken his boasting seriously. They had paid him considerable sums to cast ‘death spells’ on other convicts and staff whom they regarded as enemies. Since his curse against me hadn’t worked, they were now wondering whether their investment had been well-advised. Sure enough, the deadline for those deaths also passed without so much as a head cold among his intended victims. He ended up requesting protective custody in the Hole, and was eventually transferred to another institution. There were too many angry inmates wanting their money back for him to dare show his face on the compound ever again.
(I hope the Lord will forgive my less-than-pastoral pleasure at his predicament…)
Well, if he used a 'curse tablet', I'm delighted (although not surprised) that it didn't work!