I was making a yarn bowl as a gift for my mom out of some cherry I cut and rough-turned in France. I did something stupid on the bandsaw and almost cut off my right thumb, got hit in the chest by a flying bowl, destroyed a $45 blade and almost had to scrap the project completely. I fixed my screw up and learned some really good lessons in the process.
Skip ahead to 6:23 if you are just here to see the stupidity.