One of my favorite things to do in Tribes 2 when I was just messing around was to grab a satchel charge and a Shrike or a grav cycle. Then I'd abandon my vehicle somewhere near the enemy base, drop the satchel charge in it (which was harder than it sounds), and wait around nearby. The next enemy to see the vehicle and go "Hooray! Free ride!" pulled a Team Rocket.
Another fun of killing people with vehicles was to take a Shrike, loop around behind the enemy base, and skim their towers. Usually there were a couple of heavies camped out there on defense, but they were almost always facing the wrong way. You could usually wound and kill one before they noticed you.
Also, I was really good at placing turrets. I probably got more turret kills than dueling kills, ever.
The most ridiculous kill I ever got, though, has to be this one time when I was playing some random mod. I was in heavy armor, and I'd spent a lot of time sneaking under water to an area behind the enemy base. As I was trudging up the slope to start spamming my mortar, one of the defenders (who for some reason was behind me) noticed me and started firing his spinfusor at me. He wasn't very good at it; without turning around, I kept on walking up the slope, moving slightly every once in a while so the disks just flew past me. He was firing the things as fast as he could, and by that point I knew exactly what the reload time of a spinfusor was, so dodging wasn't very difficult, even without looking. Eventually I guess he ran out of ammo or something, because he ran past me, back towards his base; a little bit later I opened up with my mortar and unleashed footballs of doom, killing him and wrecking a lot of his base in the process.