Oxymorons

My Fellow Comedists,

Today the less short of the short people asked "What is an oxymoron"? Not wanting to use "jumbo shrimp" or "military intelligence," I came up with "vegetarian meatballs." I'd have said "happily married," but TheWife would have slapped me. Other than "working philosopher," what are your favorite oxymorons?

Live, love, and laugh,

Irreverend Steve