Here are our favorite viral videos of the day:
 This remarkable British TV promo for The Simpsons is a meticulously staged a live-action re-enactment of the show's opening. Spot-on.

From this past weekend's Saturday Night Live: Natalie Portman (left, with SNL-er Andy Samberg) cleverly prepares moviegoers to see her as a badass revolutionary in V for Vendetta by trashing her Harvard-educated, nice-girl image with a hilarious gangsta-rap rant. Another taped bit featuring stealth weapons Chris Parnell and Samberg, who are singlehandedly saving the SNL brand from irrelevance this year.

-Okay, if you've already seen both of those -- they're all over the Web -- you still probably haven't seen this clip, featuring the Best. Robotic. Army. Dog. Ever.