27. Tip 2: Don't petrify so many people with your hideous face that King Polydectes starts sending Greek heroes out to decapitate you.
Which monster in Greek myth failed to obey that advice, and had her famous head adorned atop Athena's shield?
From Quiz Heads You Lose
Answer:
Medusa
The story of Perseus, the killer of the Medusa, begins with the hero's grandfather, Acrisius, who was told by an oracle that he would be killed by his grandson. Furious, Acrisius locked his daughter Danae up in a tower, determined that she'd never conceive, and therefore, he couldn't have any grandchildren. Well, that didn't work, because Zeus, the chief Greek god and general luster for beautiful mortal women, visited Danae in a shower of gold and impregnated her.
Of course, when Acrisius found out that his daughter had given birth, to a son of Zeus no less, he was so irritated that he threw Perseus and Danae into a coffin and shipped them off to sea. They were saved by the gods, though, and arrived at the island of Seriphos, home of King Polydectes, who ended up marrying Danae. Polydectes didn't like his pesky step-son, so he maneuvered Perseus into going on a quest for the head of Medusa, surely an impossible goal. Medusa had been cursed by Athena to have the hair of snakes, which was so terrifying that it turned onlookers to stone. It wouldn't be an easy quest.
So, Perseus got even more help from the gods, who were apparently fawning over him, since Hades gave him a helmet of invisibility, Hermes gave him winged sandals, and Athena gave him a mirror shield. Perseus cut off Medusa's head by gazing at her in his shield rather than looking right at her, apparently because a perfect reflection of a hideous face is less hideous than the actual hideous face. After some more fun adventures, he delivered the head back to Polydectes in a flourish, turning the king to stone. And for fun, he later went to an athletic competition to prove how strong he was, and threw his quoit so hard that it tragically killed an innocent onlooker. The onlooker was, of course, Acrisius, so the prophecy was fulfilled too. Athena took Medusa's head and placed it atop her shield, or aegis, striking fear into her enemies in war.