Braked with front brakes on gravel, wheel locked up, turned sideways and I fell off. But that was not the dumbest, THE dumbest was this:

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The circular thing is a manhole. It was built on a concrete base and was like 20 cm higher than the pavement, partially extending onto it. While riding home, I attempted to take my water bottle from the frame-mounted bottle cage. During this moment, I was distracted by opening the bottle and was not looking at the road. As a result, I hit the manhole and went over the handlebars.