"A Boston Herald reporter asked the 70-year-old conservative Roman Catholic if he faces much questioning over impartiality when it comes to issues separating church and state. "You know what I say to those people?" Scalia replied, making the obscene gesture and explaining "That's Sicilian." ...read on"
I'm Sicilian too, but I've never seen that in our handbook. I have witnessed many people "flipping the bird" when they are experiencing road rage though. Attending mass usually has a calming influence on many people just after they leave.
Scalia also has a problem with Gitmo detainees.
Update: There's some question about what gesture he made. The article's title is: "Justice Scalia flips the finger in church"