If helmets are on sight, you need to wear one. If you wonder if you should wear one, you need one. Unfortunately, I know too many people who refused to plop on a helmet for fear of looking uncool, and now they have a few missing teeth or lifelong concussion repercussions.
Whatever you do, never enter a confined space with an already unconscious person present. Chances are they passed out inside the space, and so will you.
Intuition exists for a reason, to protect you from danger without the explicit understanding of the threat. As the adage goes, always trust your gut. It may save your life.
This is a safety issue for pocket walkers. Never put your hands in your pockets when walking down a flight of stairs. If you trip and plummet down the stairs, you have nothing to grab onto and could face severe injury.
Never turn your back on the vast body of water, especially if you’re swimming way out into the deeper parts of the water. Swimmers ended up swimming out farther than expected because they miscalculated how far out they were.