The can opener in Suits is a running gag between Harvey and Donna that involves a can opener and a handful of thumbtacks. The ritual was introduced in the first season of the show and was never fully explained, with the creators intentionally leaving it a mystery to add to the shows appeal and allow viewers to come up with their own interpretations. The can opener ritual was revealed in season 3, episode 6, where Harvey randomly suggests using a can opener as a new ritual after their previous whipped cream ritual was ruined. The purpose of the ritual is to establish a strong bond and partnership between Harvey and Donna, and it is used to effectively establish their strong bond as co-workers. The shows creator, Aaron Korsh, has confirmed that there is no canon explanation behind the can opener procedure, settling the debate about its purpose. Despite many theories online, the show never truly revealed what exactly Harvey and Donna use the can opener for, and this is for the best, as it allows viewers to come up with their own interpretations.