Park next to him. After game remove tire iron from trunk of car. Walk up behind him. Hit him, in this order: lower back, stomach, front of left knee, side of right knee. To finish, flip him on his back, remove 9mm with duct taped handle (granted it shouldn't really matter who sees you doing this 'cause the guy kinda sounds like a douche), turn him onto his stomach. One shot in the spine and one to the back of the head. You're welcome.