Laid back!Brian Williams visited "The Tonight Show" Monday, and Jimmy Fallon welcomed him with another amazing rap video. Pulling out individual words from "NBC Nightly News" and editing them together, it looked like the anchor was rapping Snoop Dogg's Grammy-nominated hit, "Gin and Juice."A few more NBC stars popped up in the now-viral video, including Natalie Morales, Richard Engel and Lester Holt. "I had reservations about Lester," Williams joked. "It's because of his flow."  Of course, the late night host has been doing this to Williams for years now, putting him into the Sugar Hill Gang's 1979 classic "Rapper's Delight," N.W.A.'s "Straight Outta Compton" and even another Snoop song, "Nuthin' But A 'G' Thang." "It's all anyone mentions to me anymore," Williams said to Fallon of the compilation raps. Actor Cuba Gooding Jr. spotted Williams at a New York Rangers game recently and told the newsman that...