Allison Williams stopped by “Late Night,” and talked about a recent scene on “Girls” where her character sang a slowed-down, sung version of Kanye West’s “Stronger.” Problem is, Allison didn’t know it wasn’t supposed to be a slowed-down, sung version at the table read. “I was like, ‘Oh my God,’” Allison said. “‘I’m gonna have to rap this thing. OK. And so, the moment comes in the script and I go for it. I rap the entire song.” And no one was “mean enough” to stop Allison.