One of my mates didnt use the proper clothing too. He wanted to go hardcore, just a vest and undies underneath a coverall. long story short, a paintball caused a blister/cut on his back about the size of a bottlecap and it got infected and he was inhospital for a week coz of it. he acted tough like it'll get better. it went green and pussy and gross, the doctor had to remove bits of plastic and s**t from it.