I play a game with my young teenage son while he's out helping me at the farm where I randomly pop him a question "What's dangerous here??" and make him examine a situation and tell me what to watch out for...
Might be something jacked up that could fall, arc welder eye burn, possiblity of shorting a 12v connection, something flammable, or whatever...
Today working under a sweep plow, I was getting out from under it, intent on going to get a wrench, when I thought I glimpsed a coiled up rattlesnake... It was just a split second image burned in my mind, so I looked and looked but couldn't find one anywhere under it, so almost went on to the pickup - but couldn't shake that image, so I went back to look carefully again...
Finally just about decided I was just going crazy or hallucinating, when I saw him again... He was about a 3 1/2 footer coiled up in the depression under an implement wheel right where we were working...
Anyway, I made my son try to figure out what was dangerous and finally had to point the rattler out to him, too, so I guess it wasn't purely my aging eyesight!! ha...
Howard