The Underpants Bandits is a children's book series by Mik Davies, which focuses on two boys named Bryce and Brody who go back in time to steal underwear from famous people so they can put them in a museum. There are 26 known books in the series. They were banned in Greg's school because of the rude humor. It was mentioned in Double Down when Greg says that he saw a Unidentified Kid walking down the hall with his Underpants Bandits book earlier this week, until an Unidentified Eighth-Grader Bully gave him a atomic wedge.