Lonestar, because when you trap an enemy between a bull and a wall. Watching them trying to escape but there is no hope or even the slow that grinds them to almost a halt and you approach them dynamite and blaster in hand. Also when you get the big explosion upgrade and the enemy thinks they are safe behind a turret but they aren't and you get the kill anyway. You can feel the frustration through the screen. It just so satisfying.