Occasionally, their relations are featured, with humour derived from their similarities to the couple. In episode five of series two, audiences were introduced to Sam's parents, played by guests Paul Whitehouse and Geraldine McNulty, who are depicted as sharing their daughter's verbosity and idiosyncratic sense of humour. In the 2005 Christmas special, it was revealed that they have two children, who look like them and who behave in a similar manner. Paul and Sam made only two appearances in series three, featuring in the last episode and still very excitable over the slightest thing. It is usual for Paul to ask a question to which Sam would reply "I dunno!", again followed by an exaggerated and totally silent laugh.