Thongs aren't the best footwear for washing cars, boats, trailers etc. Years ago on a hot morning I was washing our boat. Hot and I'm wearing thongs. I picked up the draw bar of the trailer to push the boat back into the garage. Wet driveway, wet feet, and thongs. that boat is heavy so I push hard. My left foot slipped over, I heard a loud "crack" and pain.
I ended up in hospital that evening having tried several beers to fix the problem but the pain kept getting worse. A bone in my foot had split length wise. Took a long time to heal. Now days its boots or shoes for outdoor work on vans and the like. Thongs can be deadly.