Thing 1) for the Danger Panda thread a couple of years ago, I had a couple of goes at it down a short section of 18" wide boardwalk with thick, waist high nettles either side.
I thought that would tick a lot of boxes for the brief, but I couldn't muster enough composure for long enough to get a picture worth posting.
Thing 2) Stag do a couple of years ago, early morning, hammered, a drunken wrestle with a mate ended up with both of us in the nettles.
Quite how stingy they were surprised us both, and we then concentrated our efforts to finding the most powerful nettles, and seeing who could outdo the other in flogging themselves on the inside of the forearm. Those little swollen bobbles you get all merged together completely from wrist to crook of the elbow.
I remember feeling at the time that was an intriguing insight into pain, adrenaline and masochism. It was certainly addictive. Maybe we'd run out of booze. Either way, I look back and shake my head now, it was bizarre.