or
Why bad things happen even when you've evaluated every risk...
Cutting the radius arm bolts (wonder why people don't coat them with anti seize when installing polybushes?) with a disc cutter (guard removed for access) , so-
Visor? check
Glasses? check
Ear defenders? check
Welding gloves? check
Air bag, lines etc protected from flying hot metal in cutting arc? check
Using a 1mm stainless cutting disc for speed and accuracy. Must have twisted grinder slightly, disc explodes in face. Feeling smug that Mr Health and Safety had all the PPE on to prevent injury. Pop out to change disc. Scoot back under car to continue mission. Steady drip of coolant onto visor.
Bit of disc gone straight through middle of rad, which wasn't anywhere near cutting arc.
Bugger...