Probably the 2 greatest kills I've ever gotten happened to me randomly. The first incident took place at Evergreen Mills. I was crouched on the ridge, with a modified Stealth Suit and a Silenced Scoped AWM, picking off Raiders while the suit's stealth field was active. I find 2 raiders standing right next to each other right in front of a wall. I opened up VATS and selected the head of one of them twice, and clicked accept. The first shot in VATS missed the Raider that I had targeted, and hit the one right next to him in the head, blowing it into tiny chunks. As I stared in amazement at what just happened, the second shot hit the raider I had targeted, killing him in the exact same manner. The second incident was at the Adams Airforce Base. I was using the Victory Rifle, and an Enclave Soldier was raining plasma fire on me from the top of a semi-high building. As I popped from cover, I took VATS potshots at him and knocked a bit of his health off. Then, a VATS shot aimed at his chest hit him with a critical and brought his health down quite a bit (but he still had about 1/4 health left). Now, the critical effect of the Victory Rifle is a knockdown. However, the force of the knockdown (and the knockback was shown during VATS) knocked him off of the top of the building. Suddenly, the familiar "CHA-CHING!" was heard and I gained some XP.