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Sam and Mark celebrate some of their favourite hidden camera pranks from Big Friday Wind-Up. Tracy Beaker author Dame Jaqueline Wilson surprises her biggest fans.

Sam and Mark celebrate some of their favourite hidden camera pranks from Big Friday Wind-Up. The boys go undercover in Yorkshire, and Conor Maynard and Tracy Beaker author Dame Jaqueline Wilson surprise their biggest fans.

First shown: 5pm 8 Apr 2013
Available for 18 days Duration 28 mins