A few subtle clues. If you find someone like this, there is a good chance they are suffering from depression. Or are already dead.
I wasn't found exactly like this at any stage but I've been close and drawing it really made me wonder just how scary it is for the wife/husband/gay life partner/aquaintance/rent boy who has to live with someone who is prone to depression. Having been through it a few times, I like to think I'd know the signs myself and see it coming but I know the last time I was hit bad, I didn't have any idea until I was completely in the mire.
I'd say people like us are a pain in the ass but I guess that's why it should be recognised when your wife/husband/gay life partner/aquaintance/rent boy sticks with you and helps you look out for those warning signs.