Richard Hammond's Brain Reaction

David Baddiel, standing in for Johnny Vegas, goes head to head with Victoria Coren Mitchell. Guests Bobby Mair and Lou Sanders join the fun, while comedian and brainiac Ria Lina tries to keep things on track.

In a game called Ham versus Hamster, a heated discussion about gravity and freefall nearly ends in a fight. Lou employs some outrageous techniques in a bid to raise David's heart rate.

The teams meet Britain's tallest man and former Harlem Globetrotter, Paul 'Tiny' Sturgess, as he takes on a weather balloon, and Bobby gets very worked up over whether a woman can run faster than fire. If you want to know the answer to this experiment, you'll have to tune in.