Here's one I'll share. Me and a mate were on UK22 server one afternoon and were busy looting stary after a quick run to the NWAF. After grabbing bits and bats from the tents we ran north, up into the tree line to make a quick exit. As soon as we reach the edge of the trees, I noticed a player at the deerstands, across the open fields around 700m away. I yell "get down" and we both observe him with binoculars, our M4's at the ready. We debate what to do, he's way out of our firing range and "normally" were friendly guys and let players go on there way, so we watch him scamper up into the treeline and eventually lose sight of him. We lay there, debating weather or not to go check the deerstands for any loot when I hear a bullet fly over my head and thud into something. My mate yells "I'm hit" and I stand up and run into the bushes. Meanwhile his blood has dropped from 8000 to 400 in a matter of seconds, and we manage to bandage up the wounds and give him a blood transfusion. During the melee, I saw the nametag of the sniper and asked if he was friendly....he told me he shot because we were aiming at him.... I explain they were binoculars and we were just observing from afar. Anways, he ended up apologizing, and offered us a blood bag in exchange of some M24 rounds I was carrying, he even started a fire for us so we could cook our meat as we were both without matches....we both went on our merry ways and vowed to not shoot at each other if we ever crossed paths. Coming into Arma 2 as a complete noob, and mainly having a background of CSS and Battlefield, that was one of the best freaking shots I've ever seen, and the sound effects were amazing. I literally crapped in my pants! Plus going from shooting someone, to then helping them out is totally unique to DayZ, one of the best gaming moments I've had. Great stuff. :)