Mine would be Anthology of Interest II, and just for the video game portion because when I first saw it I couldn't stop laughing at all the great references.
Umm...the final episode. Futurama should be made into a musical. I'm entirely serious.
Old Numbuh 4: *to young self* Don't get that mohawk in the 8th grade! It took me forever to grow my hair back! And most importantly, I always regretted never asking out *disappears*
Numbuh 4: *As Mr. Huggykins* I love you.. Numbuh 3: *cheers* say it again! Numbuh 4: Don't push your luck!