Tell him about how Alice is secretly changing his whole wardrobe into girly stuff. Oh, by the way, she burned all of his old clothes, and maxed out his credit cards so he can't go back and get replacements.
Jacob is in love him. Deeply and irrecoverably in love with him, and wants him so bad that it's driving him mad!
Light the pants he wearing on fire.
Tell him Bella is actually a transgender.
Tell him Bella has AIDS and STD.
Travel back in time and sent him into Raccoon City and leave him there when the nuke was about to hit the city.