AquaScum 2003

The AquaScum 2003 is a device that is bought by a dentist Philip Sherman for his office fish tank after Dr. Sherman enters his office one day to find the tank dirty (caused by Nemo, who successfully jams the filter). It is designed to automatically scan the tank for any filth to remove with its laser beam. Rather than taking his fish out and putting them into bags so that Dr. Sherman cleans the tank like he presumably once used to do, the dentist instead installs the device, thus sabotaging any chance of his fish, especially Nemo, from escaping the office.

At the end of the film, the device stops working, despite having a lifetime guarantee, much to the chagrin of Dr. Sherman, who is then forced to clean the tank himself by taking the fish out and putting them into bags (However, the fish manage to escape the office this time).

Trivia

 * 2003 may be a reference to the year in which Finding Nemo was released.