I liked the glitch in Two Worlds - if you don't talk with the fist questgiver (who is a disguised end boss) and instead attack him and get him to hit some villager npc in nearby village with fireball splash damage - all the villagers attack him in revange and kill him quite quickly - and the credits roll :) It's like 3 minutes and it (unintentionally) makes a great statement - normal people don't need heroes, we just need to work as a team and we can win by ourselves ;)