The list of silly things is long and memorable, but the dumbest are usually executed by my hunting partners or me.
On one occasion, I went to pick up a duck that was dead before it hit the water. You guessed it, it wasn't very dead at all, and I left my gun in the blind. In a desperate attempt to catch up to it, I broke into a slow jog through the knee deep water. Hello Mr. Tree Stump. I went totally under and apparently scared the duck enough with my flailing and splashing that it flew away. No fewer than three other groups witnessed this spectacle. Yeah, I'm living with that one.
Here is another. When preparing for a season, my partner declined our assistance in helping him back his truck across the narrow high ground in a marshy area. He got off center, gunned it and buried it up to the axles. After several hours of him trying to dig it out in 95 degree heat, he gave up and we went to find a farmer with a big tractor. After returning with the good Samaritan farmer, my friend got behind the wheel of his buried truck and yell, "Do you want me to keep the wheels straight?" The tractor driver laughed and said "You can if you want, but it won't make any difference." We still stumble on those ruts.
The most dangerous award has to go to a group of hunters who took a boat across a lake in Missouri. They did this a couple of times per week during the duck season. With two huge guys, plus two regular sized guys, dogs, guns, etc, the boat was about two inches from taking water over the sides. Not a life jacket amongst them. To my knowledge, they are all still alive.