Yes, yes, I know, all you cool young cats are out watching HPpt7b at the multiplex but I'm wading through HP4, reading a chapter a night to my daughter.
So. We've just got to right near the end where Barty Crouch Jr reveals that he pretended to be Mad Eye Moody and then ever so cunningly placed Harry's name in the titular goblet, ever so cunningly steered him through the various challenges and ever so cunningly ensured he would win the tournament and touch the tri-wizard cup first. This cup he has cunningly turned into a portkey that will transport Harry to Voldemort! The scoundral.
WHY? WHY? WHY IN GOD'S NAME DOES HE BOTHER? WHY NOT JUST TURN HIS COFFEE MUG INTO A PORTKEY ONCE HE'S AT HOGWARTS AND SAY 'HARRY, BE A DEAR, PASS AN OLD AUROR HIS COFFEE WILL YOU?'