A new study by the University of Westminster reveals that watching scary movies   can burn up to 200 calories a sitting. The adrenaline rushes that viewers experience   during a 90-minute horror film are believed to use up the same amount of energy   as is contained within a bar of chocolate. Participants' heart rates, oxygen   intake and carbon dioxide output were measured and the study found that on average,   the number of calories used increased by a third during horror film viewing.

The top 9 calorie-burning horror films are as follows:

1. The Shining: 184 calories

2. Jaws: 161 calories

3. The Exorcist: 158 calories

4. Alien: 152 calories

5. Saw: 133 calories

6. A Nightmare on Elm Street: 118 calories

7. Paranormal Activity: 111 calories

8. The Blair Witch Project: 107 calories

9. The Texas Chain Saw Massacre: 105 calories