Fan Casting Unstoppable Rage in Sort by Tropes

One of the worst things you can ever do with a hero is to do something that gets them well and truly furious, because rage makes good guys unbeatable. They will go into a frenzy and become stronger, faster, braver, more agile and more indestructible than they've ever been, and they will annihilate you. This holds particularly true if the character in question is generally meek and feeble. Often indicated with Angry Eyebrows in animation. Caution must be employed by the character, since such tantrums can sometimes lead to a Heroic BSoD.