Crocodiles are a species that have particularly dexterous memories (via Heavy). While this might be an evolutionary strength for these scaly creatures, it might not be a human trait that should be improved much further, as evidenced by this episode’s “Black Mirror” technology – the ability to play back your memories.
The episode begins with the character of Mia, who is out with her boyfriend indulging in some coordination-altering substances. On their way home, they run over a biker and hide the body in a panic. A full 15 years later, Mia’s ex-boyfriend decides he wants to come in. At this point, Mia has built a successful career as well as a loving family. With too much to lose, she panics again and ends up murdering her ex.
Unfortunately, that same night, a car accident occurs right outside Mia’s hotel, and an insurance agent pays her a visit with the assignment to extract her memories as a witness. Mia can’t back down unless she wants to go to jail for murder, so now she’s forced to murder the insurance agent and the newborn baby, who she didn’t know was in the room until the deed was done. However, Mia leaves a witness – a guinea pig – and the episode ends with the police arresting Mia while she is watching her child’s play.
The last turn of the knife? The baby was blind, meaning she killed it for nothing, a devastating addition to an already devastating episode.