What's the dumbest way you've sustained an injury, and what was the injury?

I used to work nights. When I had the next day off, I would usually stay up all day and go to sleep that evening. So, wake up around 2-4pm Friday, go to at 10pm to 6am Saturday and not sleep until Saturday evening.

This eventually caught up with me. I was riding a bicycle down a hill, just coasting and fell a sleep for a second. Down I went. Need stitches in my head ( I still have a bump), tons of road rash, and banged up my knee.

I recovered fully except for the bump on my head.