Some guy I work with was using an angle grinder to cut some bits up. Anyway, the grinding disc dug in and it flicked back, getting him right in the face!

Slashed him from where his jaw bone is, up his cheek, and across his nose

He said he didn't feel any pain at all, the fooker even drove himself to a hospital with tea towels wrapped round his face, to literally hold his face on. Didn't get as far as his eye as he did have goggles on, so really, he had a very lucky escape!!