Jay Leno Rips NBC Executives as "Snakes"

After a back and forth that started with his jokes about the network's sinking ratings

Jay Leno isn't backing off the NBC jokes, despite a recent report that entertainment chief Robert Greenblatt is upset over his recent jabs at the network.

"You know the whole legend of St. Patrick, right?" Leno said in his monologue on Monday night's The Tonight Show. "St. Patrick drove all the snakes out of Ireland—and then they came to the United States and became NBC executives. It's a fascinating story."