There are many type of hazards that can be found on golf courses. Ponds, ditches, sand traps and rocks are some that spring to mind.
While playing a round of golf at Palm Beach Gardens Golf Course this afternoon, I encountered a moving hazard on one of the holes:
It was a bit more than 2 feet long and started gently hissing when I crouched down to take its picture.
On the next hole there was another one that was 8 feet long lumbering along towards one of the ponds.
Everyone on that hole was letting it play through.