Interestingly, when Harry and Ron made up predictions in their Divination homework, they happened to predict, exactly, the dangers that awaited Harry in the Triwizard Tournament:
He will be "in danger of burns" (the first task of overcoming a dragon)
He will "lose a treasured possession" (Ron, his best friend, whom he had to recover from the Merpeople)
Then get "stabbed in the back by someone you thought was a friend" (his D.A.D.A. professor)
Finally "come off worse in a fight" (his duel with Lord Voldemort in the Little Hangleton graveyard)