A couple incidents of my own devising, and one failed assassination attempt;
First one, was when I was teenager. I was on my way to visit my best mate's house, a journey I'd done many times before so I was in a world of my own. For reasons I don't fully understand, I randomly stepped out into the road, no-where near any of the crossings and into moving traffic. Since this was the A6, said traffic was doing 60MPH+. I suddenly "woke" as the draft of a lorry passing by my face pushed me backwards. It left me quite shaken, mainly because - still to this day - I have no idea why I did it. It has led me to think that some "suicides" might not be intentional.
Second one was less of a near-miss but would have been a Darwin award nominee. Whilst at university on a (Geological) mapping trip. I'm on the ridge on the South side of Lough Nafooey in County Mayo, Eire. I spot an outcrop in the middle of a scree slope which piques my interest. I gingerly test out the scree and it's no too unstable, so I begin making my way out across the scree to the outcrop. But then I start to slide. Hmm, thinks I, better head back to Terra Firma. Trouble is, on my return journey I'm still slipping down the slope... at the bottom of which there is an 80ft cliff that drops me onto the rocky shore of the Loch. I am alone and my mapping partner, several miles away, only has a vague idea where in my mapping area (several square km) I'll be. I make it back to safe ground and chastise myself for being so bloody stupid.
Third one from my Sixth Form days. I was at a party, and returning from the loo I see a couple of people adding some peanuts to my drink. "Down it" I'm challenged. Well, how much damage can a peanut do? As long as I don't choke on it? Wheeeeee down goes the already-disgusting punch. I try to taste it as little as possible as I suspect some Bells whisky is in the mix too. I leave the partly not long after and go home.
I wake up being shaken by my mum with her shouting my name. I'm lying on the floor of my bedroom with the distinct smell of vomit around me. The vomit has bubbles. Bubbles?!! Turns out my drink had been spiked with washing up liquid and dishwasher powder (I suspect other things may have been added that they didn't want to admit to). No idea how harmful that could have been, but I never spoke to any of these 'friends' again.