"Animals are fine, but their acceptability is limited. A little child is even better, but not nearly as effective as the right kind of adult."

"What do you mean, ‘right kind of adult’?"

The Wicker Man (1973) directed by Robin Hardy, written by Anthony Shaffer. Starring Edward Woodward, Christopher Lee, Diane Cilento, Ingrid Pitt, and Britt Ekland.