Your significant other will be bitten by a wolf and hide it from you so you don't worry. As it turns out, it was a werewolf, on a full moon. Your anniversary will be the night of a full moon and she'll rip your throat out, julienne your liver and rip your eyeballs from their sockets, so you can't see your sweetheart anymore.
Oh yeah.. You will die by a self inflicted gun shot wound to the foot which you don't go to the doctor before because your HMO doesn't cover it