Highlights from Sam & Mark's Big Friday Wind-Up, featuring pranks, games and celebrity guests.
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Tracy Beaker author Dame Jacqueline Wilson helps wind up her biggest fan.
Hacker and Dodge cause chaos when they swap places with an audience member's dog.
JLS join the Wind-Up team to surprise three of their biggest fans.
One Direction join in to give a fan a surprise and Lemar sings his latest single.
Sam and Mark are joined in the studio by pop sensation A*M*E.
Conor Maynard surprises two megafans and gives them a special performance.
The boys are joined in the studio by acoustic duo Lilygreen and Maguire.
The boys are put through their paces in a tough assault course.
The Voice's Tyler James joins Sam and Mark in the studio.
One Direction wind-up two megafans with the help of some hidden cameras.