Watch Brian Williams rap "Rapper's Delight"

Jimmy Fallon continues to churn out viral hit after hit on his first week as "The Tonight Show" host: On Wednesday night, "Tonight" patched together a mash-up of NBC anchor Brian Williams and Lester Holt rapping "Rapper's Delight" with the news. My guess is that the result is about the same as if Williams were to attempt the rap in earnest, which is what makes it especially great.