Quietest Day Ever / Bully Bromance Breakup
S3, E24: Mum asks the boys to be quiet while she takes her online knitting test, so they spend their quiet time inventing ninja outfits that make the wearer invisible.

S3, E24: Mum asks the boys to be quiet while she takes her online knitting test, so they spend their quiet time inventing ninja outfits that make the wearer invisible.