Harry Potter has a small issue, he has a small bladder. It seems every hour or two, no matter the place, no matter the direness of the situation (nay, direness tends to make his situation That Much Worse) his urgency persists. It's also his deepest secret, something no one in the wizarding world has tuned into. Harry's need to leave class everyday is a norm, his familiarity with the halls of Hogwarts heightened from his very first week. As curses go, it's not one he'd complain about.
The TriWizard Tournament brings foreigners to his halls. Harry gets noticed by Fleur Delacour, who confronts him the second week at the school after seeing him enter a girl's bathroom. Desperate to not reveal his most confidential secret, he instead shows her the Chamber of Secrets and tells her the story of the dead basilisk she sees. Understanding there is more to the leetle boy than meets the eye, Fleur begins pestering him about his exploits when they cross paths in the halls.