19. Oops They're Still Alive
A common problem in the Resident Evil games. You unload your ammo into a monster/zombie and do such a good job, you assume they are dead. Next thing you know the zombie is chewing your foot and you gasp with annoyance and shock. Resident Evil 5 seems to me to be one of the biggest 'Oops they are still alive games'. Particularly when the dead bodies release one of those flying thingymajigs into the air and they pack a lot of damage.