I always wear my helmet.
Several years ago I was on a test ride around the block after tweaking something on the bike and a dog ran in front of me. I hit it and did an endo, fortunately landing on my shoulder, instead of my head.
That was the last time I went out, even for a short ride, without the helmet.
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.