When there was plenty of evidence to support one thing but something else happens in order to advance the plot. EX: Naruto one hits a man that survived a fight against the first, survived for unimaginable amount of years and was trashing teams of 6+. Better yet, Naruto lays only one punch against Neji and he looses after consistently trashing Naruto for quite some time. That brought up the question, why doesn't he get up and fight again like Naruto does? After all, if he had, there's no way in hell Naruto would win.