Wait Wait...Don't Tell Me! is NPR's weekly hour-long quiz program. Each week on the radio you can test your knowledge against some of the best and brightest in the news and entertainment world while figuring out what's real news and what's made up. On the Web, you can play along too.

Each week, Peter Sagal quizzes the panelists and listeners to determine just how closely they paid attention to the week's news. He serves up questions in all forms: lightning rounds, tape from NPR news shows, multiple choice, identify the "fake" stories, and fill-in-the-blank limericks. Listeners call 888-WAIT-WAIT for a chance to win the most coveted prize in all of public radio: a custom-recorded greeting by Carl Kasell for their home’s answering machine or voicemail.

One of the most popular segments is "Who's Carl This Time?," in which Kasell recites quotes from the week’s newsmakers as contestants guess who he is impersonating. "This is the only show where you'll get to hear NPR's most senior newscaster impersonate Britney Spears," the Wait Wait producers say. Another signature Wait Wait...Don’t Tell Me! game, "Not My Job," invites well-known celebrities to answer questions that are out — way out — of their area of expertise.