Even when being harassed by everyone and everything, I'm at least ludic enough to maintain determination to trump the situation.
Keeping that in mind, I confess to having thought about killing myself. But it truly is a neutral wonder.
Only out of curiosity has it ever come to mind -- that is to say, I've never derived from any source motivation or any inspiration to do it; at least not directly. I have deliberately grabbed an electric fence (the kind for keeping deer out of a garden) and hope to be struck by lightning before (or as) I die. I've more than once participated in most extreme sports what can be done so in suburbia, and have otherwise engaged in activity that was obviously dangerous. Some say I'm suicidal. Others say I'm brave. I don't care for either of those. I'm not suicidal, and I don't think it counts as bravery when you're more afraid of not knowing what you missed than of being hurt or killed.
The curiosity I'm talking about is entirely mental. I wondered what would happen if I died at my own decision. So I suppose the thought was less about killing myself and more about the result, but since suicide is indispensable to satisfy, of course it entered my mind.