1) jack baurs wife's heartbeat stops in first season of 24. I was really mad.
2) in devils advocate, when the wife finds the baby in her house, and it is playing with her uterus, and she will never have kids. This one pissed me off for days.
Cheating over to videogames:
Aeris death in ff7 was a huge shocker. She was a playable character that I was leveling up, and then, suddenly, dead. Killed by main bad guy. Never coming back. Was shocked, then awed, by that.
There was an N64 game called Eternal Darkness based on HP Lovecraft lore. In it, if your character saw too much scary stuff, he/she would walk into a room and something wierd would happen, like your arms would fall off. After that, a voice over would say "THIS CAN'T BE HAPPENING" and everything would return to normal.
So, I am getting close to finishing the game, haven't saved my game in a couple of hours, but time for dinner so hit save.
Blue screen of death, Ala Microsoft windows. Total game crash. Buffer overflow. Progress lost. Super pissed.
Nope. Voice over of this can't be happening, then back to the save screen. Total prank by the developers.
Never been more surprised / tricked by a writer. Was infuriating, then hilarious, and now awe inspiring.