It's only one red sock

When doing the prison laundry, Paddington accidentally lets slip in a red sock with the standard black-striped white prison shirts and slacks but decides to let it pass, figuring it won't be a big deal. In the next scene, he thinks that the new pink look of the outfits really brightens up the place, though the looks on the faces of the other prisoners say otherwise.

Example of:
Red Sock Ruins the Laundry