I liked the ending to Lisa the Iconoclast as well. When you think about it, being in Lisa's shoes, it would be difficult to reveal the truth knowing that it will only hurt the town and they will discriminate you. I like how it's different to other endings as well, considering most of them end the same typical way a typical episode of The Simpsons usually ends. It's a nice change for once.
Anyway, back on topic:
Greatest Story Ever D'ohed: Erase the whole episode and turn it into an episode about Homer experiencing deja vu on his birthday or something