Not too long ago, I took three friends draining. If you've seen the pictures, it's a massive riverside tunnel entrance that stretches for 1.5 km before surfacing at a railway bridge.
There, to get to the other side of the intersecting bridge, you have to pass through one of five slots that are a little over a meter tall, depending on the water level. Right now it is iced over.
First time I went, I took one step and my foot went through the ice, getting a bit of water in my boot. The second time, the ice was thick enough and three of us made it across. The third time, disaster struck.
There were four of us, and in my usual hurry I was a fair distance ahead of everyone else. Then the ice cracked, and I fell directly down into the freezing sludge water. It went up over my knees, and my camera was almost dunked. Unpleasant, but I don't think it was caused by poor decision-making.
Okay, the nomination goes to the user known as Altf4. As I was pulling myself back onto the ice shelf, she ran over to help me, cracking off more of the ice and plunging us both back in again. She slid in at more of an angle, soaking herself up to her waist, as well as her backpack.
Anyway, it was a very unpleasant bath and the water we poured out of our boots was opaque black.
Aftermath pics:
Note that although my knee was injured, it was caused by my actions, not her ill-advisable attempt of a rescue.