Take these seriously
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Talking about suicide.
Statements about hopelessness, helplessness, or worthlessness.
Preoccupation with death.
Suddenly happier, calmer.
Loss of interest in things one cares about.
Visiting or calling people one cares about.
Making arrangements; setting one's affairs in order.
Giving things away.
finding little or no pleasure in life
feeling worthless or extremely guilty
crying a lot for no particular reason
withdrawing from other people
losing interest in hobbies and pleasurable activities
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That's all I have so far... If you are worried that a friend might be suicidal, please call 1-800-SUICIDE.