After welding, torch cutting, or heating metal, be sure to mark it HOT so others won't pick it up & get burned.
I'll play. Don't use chemicals that off gas while wearing an athletic shirt. Athletic shirts like Under Amour or Nike Pro Combat are designed to wick away moisture (sweat) from your body, but they will wick away anything in the air if the area you're working in isn't properly ventilated and your exposed to a flame; like striking the arc on a mig welder 7 hours later.
2nd/ 3rd Degree Burns after the shirt fused to his chest.
You have the same issue in motorcycling -- there's a certain type of person who not only wants to ride wearing no protection whatsoever, but actually wants to prevent others from wearing helmets, gloves, armored gear, etc.
Very strange mindset, and quite frankly I do not want to work or ride around people that dumb who also want to spread the dumbness.
Let the heavy thing fall. My dad tried to catch a transmission working under a lift and broke his arm. I attempted to save a compressor as it was tipping over and paid for it by pulling muscles in my back, big time. Could have been way worse, too. I watched a guy get submerged when his outboard motor came off when he and another were doing some sort of repair at the loading ramp. The motor took the guy completely under. He should have let it fall. Luckily there were folks around and it ended with laughter.
Don't stand in front of someone swinging a sledge hammer when it's raining. Seems like a specific thing to mention but I paid the price on this one and in the 20-something years since, I have been around the similar situation at least a dozen times.
Mark: is there a reason you don't toss them in the scrap bin or trash immediately? good thinking though for certain.
cheers
Drives,
It generally takes me ~3 months to fill a container with sharps. It wasn't an injury that caused me to start doing that, it was having 2 flat tires on my motorcycle, at $40 per flat. One was from a discarded staple and a pop right mandrel.
Keep a plastic jar handy to store discarded nails, box cutter blades, wood/sheet metal/drywall screws or any other "SHARPS" that could end up in the floor and maybe, eventually in someones foot. After the jar is full, it's easy to dispose of. The plastic jar should have a lid, in case it gets knocked on the floor.
Metal shavings from my mill, or drill generally get placed in a sealable cat litter container to be disposed of when full.

I was using a Dremel last night. As soon as I was done using it for something (but not done for the night) I immed. unplugged it from the extension cord. Removes the risk of accidentally sitting on the ON switch or something, when it's just lying there.
When my dad had a body shop, he had a rule to get all the welding done 2 hours before closing time, if possible. If not possible, he or I would stay after closing to watch for any stray sparks that could cause a fire.
MSTR:
ALL: i keep reading about hanging around in your shop cleaning up for an hour and probably two after welding. how many shops burn down because of leaving when something is still burning somewhere in the shop?
speaking of burning down any of you use stain on your wood projects? well i've seen a garage burn down because of a stained rag that was left on a wood bench and heard of many that have. get the rag out in the air to dry or throw in a metal bucket with a lid so it doesn't combust into flames and ruin your day or year.