Oh my, so many things I've done. Small ones like the Op, I never licked a pole, I knew that was foolish, because I'd experienced problems with ice cubes, and understood.
But foolish choices...

I went out for the newspaper one early winter, wearing only skivvies and a robe, and slippers, after a night of ice rain. I fell all the way down the stone steps from my front door into the street below.

I got into a game throwing plastic bowling pins at my brother, and broke his nose.

While working on a roof, and installing siding, I decided NOT to climb down the ladder, carefully move it two feet, and then climb back up to hammer in the last nail needed. Instead, I carefully leaned out as far as I could to one side, took one foot off the ladder and put it on the 45 degree angle roof for balance, and tried to hit the nail. I fell twenty feet to the ground and landed on my back. Luckily, I was neither dead nor paralyzed, but it was a near thing.

WORST choice I made, wasn't my dreadful disaster of a marriage, though. I got good kids from that, and a lot of other positive experiences. My WORST romantic choice, was to try to win back a girl who cheated on me, back when I was very young. That cost me far more dearly, psychologically and in other ways. Because to do that, I had to ignore not only my own emotional well being, I had to set aside every moral and philosophical principle I had come to understand by that point.