When the daughter of Trelawny, the professor of Divination class at Hogwarts School of Witchcraft and Wizardry, met the Weasley twins. The cute little badger relied on his precognitive ability to defeat the twins, saved Fred in the final battle, and successfully became the proprietress of the joke shop.
Purpose: Regarding Professor Trelawney's inexplicable marriage and having a child/After becoming a descendant of the prophet, I relied on my precognitive ability to commit adultery with the twins at Hogwarts day and night.