Duck Quacks Don't Echo

Ross Kemp, Bob Mortimer and Sara Cox put their fascinating theories to the test by whatever means necessary.

Lee Mack is joined by Rhod Gilbert, Ruth Jones and Richard Madeley to test-run random bits of trivia and some of the world's most startling facts.

Claudia Winkleman, Johnny Vegas and Joe Lycett join Lee Mack to put a host of fascinating facts and trivial titbits to the test.