Damn... I really ought to go paintballing again. Only did it once outdoors, once indoors many years ago. It was a blast!
I got hit once on the top of my head, just beyond the protection of the mask. The ball didn't explode so it felt like I was shot with a rock. It dazed me, I collapsed behind a large boulder and couldn't get up for a few minutes. Crazy. But sure, definitely want to go again haha, it was fun.