I was in school with a lad who was definitely soft in the head, we used to call him "sooeee" (as in suicidal). Would throw himself down the stairs, ride his pushbike off of a roof etc don't know if he got past his teens and survived
A lad I went to school with (when he went) did some particularly risky stuff but I and a couple of my mates (one especially) were not far behind with taking risks, while others were scardy cats who wouldn't really dare do anything lol. Pinnel was completely reckless most of the time and did a lot of jumping from high places, like out of a 3rd floor highschool science block window because he thought it'd look funny to people in classrooms below as he dropped past their windows, the idea came to him when he noticed the flower/rose beds in the garden area below had been dug over and the ground was very soft. To most people this would seem like a jump where broken bones would be a definite and there'd be a strong chance it'd be fatal but to him it was safe because the ground was soft and it was more a question of whether he might sprain something or not, and he was right because he was able to walk away. He did the riding bikes off high places thing too, like from the roof of a local electricity substation, off the roof of a local WMC and built a ramp to jump into a lake in the quarry/tip. You never knew when you had him or if a fight would break out within a couple of minutes of meeting him but one way or the other something was always going to happen when he was present.
There used to be an old local quarry that was being used for landfill, sometimes there'd be old cars in there and sometimes they'd be precariously perched at the top of a steep pile of rubbish with a big drop at the side, we'd strap ourselves in and get other lads to push the car so it would roll sideways down the hill with us in it, we thought quite tame and safe if the car had seatbelts. Crazy jumps wasn't something I was particularly into but I did sometimes participate and once jumped with Pinnel from the top of some kind of a partition line / banking they'd made in this quarry onto the asbestos looking roof of some old building that was there long before the banking was made, we both went through the roof and landed on the concrete floor just missing some old equipment that had levers and spikes sticking out of it.
Pinnel wasn't involved in this one, it was Marky's idea - When they were building some new local warehouses and putting the drainage in there were some concrete drainage pipes, some had foot / hand grips because they were ventilation / wide manhole sections. One of us would get inside a concrete pipe and use the foot / hand grips to help brace as others pushed him down a slope, so we'd be rolling downhill inside these concrete pipes, you couldn't get out when moving or risk getting crushed by the concrete pipe so you just had to ride it out. Found one perched at the top and end of a deep gulley they'd dug to fit these pipes into, got inside and did same again down this extremely steep drop.
Light a fire in the quarry, put some old aerosols on it, then see how close you could get using an old kitchen sink unit as a shield lol. Use same shield as other mates through things at you like half wall bricks, bottles, or shot at you with air rifles, crossbows, etc.
Loads of fun in the quarry / tip. At one time the quarry lake was known as the blue lagoon because it was so clear but had become more like an oily swamp when it was used as a tip. Still fun to use old bathtubs as very unstable boats and try to slide down a steep banking into the water/oil. I once slid down a banking in a bathtub but went over a sharp rock/brick that slit the bottom of the bathtub and my backside open, which caused a lot of laughs from mates and from Pinnel. Eventually had a bit of a scrap with Pinnel down the quarry when a few weeks after cutting my backside he brought it up again and said I must be a girl because I bled from that area, told him to shut up but he whipped me with some thorns so we started scrapping and he used a window frame as a shield which I put my hand through cutting it to the tendons around a few of my knuckles, didn't hurt but I thought it was interesting to see how white the bone was and see the shoelace like tendons.