Keeping in mind what Centaurus has said above
1. any slow loss of thrust in one engine where the horizon is not obvious out the window. (this is far more common than you think) some pilots catch it while others do not until it's too late.
2. An unexpected increase in thrust prior to V1 or during final (thankfuly rare)
While, I'm not a fan of throwing rare stuff into training sylabus, it does help to discuss them on boards like this.