Depends on the people I'm playing with. Most of the time, I find a spot, wait, then make a headshot. Quickly reposition so I'm covering the spot I was at, then shoot the same person who comes to try and take me out. I do this because I use a sniper rifle in every game, so running around a battlefield with guns blazing is a poor strategy. Now, there are times where I will remain in the same spot over and over, and those times happen when the same idiot--or idiots--keep coming straight at me from the same direction. I'll kill one, get ready to move, and another one will come charging around the corner into my scope. I can't pass up such an easy kill. I decimated an entire enemy team once this way.
"Yeah, the twenty-seven other times we tried this route, we got killed, but the twenty-eight will be (BANG)!"
(Reload click) "Next."