Larry David and Rosie O'Donnell got in a fist fight, David told Dave Letterman on Friday night's show (pretaped earlier in the week, before the Letterman extortion news).
The fight, it seems, was taped for an episode of David's show "Curb Your Enthusiasm."
"She's a formidable opponent," Larry told Dave with a smile.
The much-anticipated "Seinfeld" reunion begins Sunday on "Curb."WATCH: