Happiness (1998)

The lives of many individuals connected by the desire for happiness, often from sources usually considered dark or evil.

When a young woman rejects her current overweight suitor in a restaurant,
he unexpectedly places a curse on her. The film then moves on to her sisters.
One is a happily married woman with a psychiatrist husband and three kids.
Unfortunately the husband develops an unnatural fascination for his 11 year
old son's male classmates, fantasizes about mass killing in a park, and
masturbates to teen magazines. One of his patients has an unrequited fascination
for the third sister. Meanwhile the apparently stable 40 year marriage of the
sister's parents suddenly unravels when he decides he has had enough and wants
to live a hermit's life in Florida. Obviously, the whole movie is slightly
warped in its viewpoint and certainly presents abnormal relationships among
all of its parties. (IMDB)

Premiere voted this movie as one of "The 25 Most Dangerous Movies".