Frightening people is a funny business.

Check out these hilarious photos of actors fooling about on the sets of some classic horror movies.

The most famous horror movies scare the living daylights out of the audience with spine tingling scenes that live long in the memory - especially when the lights go out.
No matter how many times we are told that it is simply a film, a piece of entertainment, classic chiller's like Jaws can stop us getting into the water or in the case of Stephen King's 'It' make children's clown's petrifying.
However, the terror is only committed onto film and when the camera's stop rolling as these behind-the-scenes pictures show, the film stars and their crew relax and joke in unexpected and hilarious ways.

Director Steven Spielberg sits in the mouth of the great white shark from his 1975 movie 'Jaws'. The film was his first summer blockbuster and the highest grossing film of all time (at that time). It was #1 at the box office for 14 consecutive weeks

A funny outtake from 1978's 'Halloween'

Sissy Spacek (right) covered in blood for the final scene of the 1976 horror 'Carrie'. The horror film is directed by Brian De Palma and written by Lawrence D. Cohen, based on the novel Carrie by Stephen King.

Linda Blair has her make-up touched up during the filming of 1973's 'The Exorcist

Anthony Hopkins takes a moment between takes during the filming of 1991's 'Silence of the Lambs'

Leonardo DiCaprio (left) and a prop from 'Critters 3' in 1991. It is the third installment of the Critters series, the sequel to Critters and Critters 2 and Leonardo DiCaprio's film debut

Boris Karloff in 1970s 'Frankenstein