This question appears in this week's New Yorker Shouts and Mumurs column, entitled A Memo From the Vatican.
16. In the Gnostic Gospels, which apostle is referred to as “scrumptious”? (This is a trick question, because, no matter what Luke says, it’s not Mark.)
Other than the fact that gnosticim is no longer believed to exist, neither Mark or Luke are gnostic texts. I believe the correct word would be synoptic, as both Mark and Luke are synoptic gospels. Grrr.