I concur that "Roswell" is Futurama's finest hour:

And, of course, there's Professor Farnsworth's angry retort to Fry's concerns about changing history, which I'd say is the series's all-time greatest line: "Oh, a lesson on not changing the past from Mr. I'm-My-Own-Grandpa!"

I'm so glad the new Futurama season has started.

And I'm enjoying the new Futurama fan art on Tumblr, too.