There are the people who cannot stand the awkward silences of a group of people; they will fill those silences with their own talking. Introverts who are not prone to interrupting folks will find themselves listening to a monologuer, monologuing.
I am bad at finding things to talk about; I'm not interested in the weather, I figure most folks don't want to talk shop and I really don't want to talk about my family or my hobbies (I'm not super private, I just figure people are bored by that stuff.) I find that most people wisely avoid conversations about politics and religion, especially if the boss is present and or the group is large enough that it's no longer "a group of trusted work friends", but "a group of coworkers, one of whom may find offense."
Readers, do you have a suggestion for how to conquer the awkward work lunch? Good, perennially safe topics? Or are we stuck going to Olive Garden and listening to the boss' description of their bowling league?