never had any bad things happen YET (touch wood) caught my index finger right behind the nail with a sanding disc,that bled quite a bit lol had to call my dad to turn the sink tap on so i cud rinse it of,most painfull ive had so far was had a spanner slip off and managed to hit myself on the bridge of my nose lol was only a 13mm spanner but hit me at a fair pace and hurt like hell for about 5 mins lol