What was the last good simpsons episode?

[WorthlessLiar]

I thought an episode last season was surprisingly redeeming. It was the one where Grandpa wants to get his license so he can impress this old lady at the retirement castle. As the wackiness unfolds he is introduced to the Souvenir Jacquitos and they have a death race.

-Your jacket, she burns!

-Then I burn with her. For I would rather die than have people not know what stores I have been to.

It was anomolously unsucky and all episodes have sucked since. I think the last good one before that may have been the X-Files one or at least the last episode in that season.