By Kate Ward
Updated March 03, 2011 at 03:03 PM EST

News anchor, sketch comedy enthusiast, and overall good sport: Seriously, after watching Brian Williams flex his impressive comedic muscles on Saturday Night Live andThe Daily Show, it’s impossible to watch him report the news without somehow feeling tickled. (I blame the ever-present twinkle in his eye.) So what a relief it was to smile while he reports the news without feeling guilty on last night’s Late Night, during which Williams (or, will.i.ams, as Fallon calls him) slow-jammed the headline-making union fight in Wisconsin. Williams’ appearance wasn’t the only thing to celebrate on the late night show last night, though — Fallon’s series officially turned two years old. (It premiered March 9, 2009.) Congratulations, Jimmy. I take it your gift was hearing Williams deliver this line when you accused him of not knowing what SWV was: “If you’re referring to the SWV who were a seminal ’90s R&B group consisting of Coco, Taj, and Lelee, and whose songs included ‘Right Here’ and ‘Weak,’ yea, then I’ve heard of SWV, but they ain’t no union.” Oh, will.i.ams, I hope you left an encouraging message for yourself after that one. UPDATE: Looks like I missed the coolest (heh) part of Fallon’s show last night — the host was honored with a new Ben & Jerry’s flavor called Late Night Snack. In the ice cream: Vanilla bean ice cream, a salty caramel swirl, and fudge-covered potato chips. Mmm… sweet potatoes