Oh my life...I'm boring.
I've done plenty of stoopid things that others may have considered to be scary/dangerous, But as I'm as thick as mince I probably couldn't see it at the time.
Erm, as a lad I did once try to dismantle a live anti aircraft shell that me and my mate had found in a ploughed field, obviously neither of us appreciated it was live, luckily my old man came home just in time to prevent a catastrophe, he saw me sat in the back garden with this shell trying to prise the timer/fuse off with a screwdriver.
Dad put it as far away from the house as he could.EOD were called out via the police, when they arrived they told my Mum and Dad they thought they were going to have to blow it up where it was, luckily they were able to take it away.
Oh yes, I once climbed out onto the top of my dormer window (my bedroom was in the attic of an old Victorian terraced house) which was on 4 floors, so I was pretty high up! IIRC my Mum was pretty scared when she looked up from hanging out the washing
More recently I'v disarmed a couple of people, sounds more scary/dangerous than it was (I think I talked them into submission really)