Oh, I thought it meant suicide by drowning (and becoming fish food). Pretty high chance of success... if you can take the leap. It's harder than you'd think.
You can't detect the lack of oxygen, only the buildup of carbon dioxide. You just get tired and pass out, it takes about two minutes. There's no panic.
If I'm ready to log off because my life has become weakness and pain, I'm not going to chicken out. But I'm not afraid of death, it's the dying I'm not so stoked about.