I have depression, and am suicidal. Nobody knows though, let's joke about that lol.
Me telling my parents I'm depressed: my parents, "No, you're just a little stressed and want attention, am I right?" My depression worsening, me: "Yeah, you're totally right mom..." Me in my head making a plan to commit suicide.....
Suicidal ideation is like wanting to slaughter someone but knowing/feeling that you can't. It's also, in a way, kind of like seeing a really hot chick that you wish you could F, but you again for whatever reason you either feel you can't or you just can't.
You must be depression, because you make me want to kill myself ;)