Fantasising about killing your boss is actually quite normal and means you're less likely to do it.

More than half of people have at one time or another imagined killing a person they know, according to a leading criminal psychologist.

Dr Julia Shaw, from University College London says rehearsing the details of a murder in the imagination reminds people of the negative consequences.

Employers and exes top of the list of people we fantasise about murdering.

And while many of us daydream about doing it, only about one percent of the population are believed to be psychopaths - and only a small majority of psychopaths will go on to be violent or kill someone.