I was using a putty knife to spread drywall mud for three years before a guy at the hardware store asked why my arms were so tired. | DIY Home Projects - Opinions Matter
My buddy tried using a flathead to open a paint can last week. The whole tip bent sideways and flew off, nearly hit his dog. He ended up with a ruined screwdriver and a huge dent in the lid. Some people just never learn to use the right tool.
Yeah, the flathead as a chisel thing. I used to think it was fine for light prying, like popping open a battery cover. Then I watched a guy try to chip mortar with one and the tip snapped, flew back and cut his hand. That changed my mind real quick. Now I just go get the actual chisel, it's not worth the trip to urgent care.