Had another facepalm just a few minutes ago.
Adventure mode, trying to find my way down after traveling all over a mountain range(No fast travel) I find a waterfall in a brook, and it is a series of small 1-2 z level drops spread out over a long trip down. Knowing how dwarves just completely shrug off such drops in fortress mode, I figured I'd go through there to get down a bit easier, and to grab a drink since my waterskin was empty.
First drop, 2z levels. Broke an arm, bruised several other parts. My sword drops but I just pick it up again. No worries, the arm will just heal.
Second drop, 1z level. By now I'm surrounded by 3z high cliffs, so no going back now. The second drop breaks both my legs, so I'll have to crawl.
Third drop, another 1z. Bruised spine, otherwise no problems.
Fourth drop, 2z, broke my hand on the not yet broken arm, drop my shield and pass out from the pain for a while.
From there on it seemed to be fine, by then the mountain around me became a bit lower, so I could see 4z high cliffs to both sides, can't go back, so I go forward.
Looking ahead, I see the brook is getting another waterfall, and hope I can survive it.
It's a 6 z level drop.
All because I wanted to drink from the brook, and then I noticed that I had armours with loads of water coverings I could drink, as it had been raining just before I jumped in. Facepalm.