i hereby declare this weekend to be....

PASTA WEEKEND.

(preferably stated with some ominous dread)

some of the other answers might get you something close (just be sure to crank the fuzz with some kind of tube preamp, and probably even a line booster - this is very high gain), but it sounds to me like that octave-y sound is actually an electronic relic of his guitar synthesizer tracking in and that the actual answer is something along the lines of digital distortion on a violin or cello patch, rather than anything created with guitar pedals you can get in a store. it's also probably manual whammy technique getting that envelope wah, rather than anything digital.