You never know what's going to take you down. I worry about dogs or kids darting in front of me, and I worry about cars, and oil slicks, etc. I've never, however, worried about my cycling gloves and water bottle being the thing that took me down.
I have a pair of cycling golves with two loops coming out of each golve at the finger openings. It's designed to make it easier to take them off at the end of a ride, and they work well for that. Today, however, I was attempting to put my water bottle in the cage. After seating it in the cage, I was withdrawing my hand when one of the loops got caught on the lip of the water bottle valve and pulled it out of the cage. It promptly fell straight into my pedal stroke, which kicked it in front of the front wheel, which then took me down as quick as you can imagine. No injuries to report, expect to my pride. I think I'm cutting the loops off tonight.
I've added a photo of the glove style so others can make an informed choice in their cycling gear.