Any display of stupidity on the part of AI allies in games, especially the ones that aren't expendable.
As a prime example, I was finishing off a run of Resident Evil 5 I had forgotten about, and got to the first fight with Wesker in the ruins. I was playing as Sheva and Chris was really excelling himself at being a right nuisance. If he wasn't managing to stand right in my line of sight just as I had a perfect opportunity to shoot Wesker with his back turned, he was standing in the open area in the middle where
could fill him full of bullets at leisure.
Other than that, anything like the ringing of the phone or anything else equally jarring. Or random strangers sending me messages about 1 vs 100.
As a prime example, I was finishing off a run of Resident Evil 5 I had forgotten about, and got to the first fight with Wesker in the ruins. I was playing as Sheva and Chris was really excelling himself at being a right nuisance. If he wasn't managing to stand right in my line of sight just as I had a perfect opportunity to shoot Wesker with his back turned, he was standing in the open area in the middle where
Jill
Other than that, anything like the ringing of the phone or anything else equally jarring. Or random strangers sending me messages about 1 vs 100.