ericyeoman
Unfortunately in my experience people who have committed suicide always appeared cheerful and up-beat before doing the deed; perhaps they'd made the decision and that gave them a release of some sort.
This ^^^^
I've seen it personally a couple of times, very hard to detect that there's a serious issue going on.
Actually, there's a scale of emotions that's divided into positive (ranging from courage to peace) and negative (ranging from apathy to pride). What really trips up people is when someone goes from being very fearful or depressed down to apathy. Most people see this as a big improvement when, in actuality, the person has simply given up. Then they're all surprised when they commit suicide. Getting them angry is really an improvement that moves them away from apathy.