Escort missions. Few things in videogames can elicit a Khan-like scream of despair from players so quickly. You’re progressing through an entertaining, tense, action-packed game when suddenly, for reasons known only to themselves, the designers force you to replay the same five-minute (if you’re lucky) section over and over, trying to prevent natural selection from improving the human gene pool by letting your hated escortee remove him/herself from it through rank incompetence.