Watching a horror film could burn off the equivalent of a bar of chocolate in calories, according to new research.
Viewers who put themselves through 90 minutes of adrenaline-pumping terror can use up as much as 113 calories, close to the amount burned during a half-hour walk and the equivalent to a chocolate bar.
The movie top of the list of calorie-burners was found to be the 1980 psychological thriller The Shining, with the average viewer using up a whopping 184 calories.
Jaws took the runner-up spot, with viewers burning on average 161 calories, and The Exorcist came third, with 158 calories.
The University of Westminster study measured the total energy expenditure of ten different people as they watched a selection of frightening movies.
Scientists recorded their heart rate, oxygen intake and carbon dioxide output - and discovered the number of calories used increased by on average a third during the films.
The research also revealed films featuring moments designed to make viewers jump in terror are the best calorie-burners, as they cause heart rates to soar.
Dr Richard Mackenzie, of the University of Westminster, said: "Each of the ten films tested set pulses racing, sparking an increase in the heart rate of the case studies.
"As the pulse quickens and blood pumps around the body faster, the body experiences a surge in adrenaline.
"It is this release of fast acting adrenaline, produced during short bursts of intense stress (or in this case, brought on by fear), which is known to lower the appetite, increase the Basal Metabolic Rate and ultimately burn a higher level of calories."
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