Increasingly, the best parts of Saturday Night Live are those that aren’t, like the filmed bogus commercials and the digital sketch bits shot on location. This angry, potty-mouthed, mesmerizing video of Natalie Portman rapping so hard it hurts, for example, is a keeper. And very viral. In what seems an attempt by NBC to suck some air out of the YouTube, the network has assembled some of its funny bits from SNL, Conan O’Brien, and The Office onto its own site for downloading: “Now, instead of searching the web for ‘borrowed’ NBC highlights, you can go to the source!” says the Peacock. (Watch Nat rap)