If your six-year-old is a seasoned little fibber, don't fret - it probably means he or she is unusually bright, according to a new study.
Scientists have found the first evidence that children who are good liars have better verbal working memories, meaning they are adept at keeping track of verbal information, a skill associated with being quick and clever.
The best liars could make and maintain slick cover stories for their lies without getting caught.
Psychologist Dr Elena Hoicka from the University of Sheffield said: "While parents are usually not too proud when their kids lie, they can at least be pleased to discover that when their children are lying well, it means their children are becoming better at thinking and have good memory skills.
"We already know that adults lie in approximately a fifth of their social exchanges lasting 10 or more minutes, so it's interesting to know why some children are able to tell more porkies than others.
"We'll now be looking to move the research forward to discover more about how children first learn to lie."