To get some easy kills with claymores, place them obvious locations such as sidewalks. Everyone always expects claymores to be just around a corner or in a doorway. However, very few players expect to see one laying out in an open area and will carelessly run onto them. One example is on the Crash level. Near the helicopter, place a claymore on the ground outside where people are always running around. Since they are running, there is a good chance they will run past and trigger it.