Suicide, the Comedy (1998)

Matt is a screenwriter whose career is not going especially well and whose personal life is dwindling into nothingness. Matt starts talking with his friends about suicide, and nearly all of them become deeply concerned, convinced his depression has taken him over the edge. Matt insists to all around him that his questions about killing himself are merely part of his research for a script about a man who has turned suicidal. But his ex-girlfriend Amanda is the only one that seems to believe it.