It's hilarious turning someone's Hellstorm/Lightning Strike/Stealth Chopper into a C-UAV or RC-XD. I used to try and steal everyone's CP's with Black Hat, but stopped doing it after awhile because it was just too easy.
Besides it's funnier when you turn someone's high KS into something practically worthless with the quick double tap of X as they're running up to retrieve it.
"Dude, who the F turned my death machine into a RC? You F'ing POS whoever did that." They actually seem to get more pissed off when you do that, than stealing their CP all together, for whatever reason.
I've had teammates leave their UAV CP on the ground and sit there and wait for me to reroll it for them. But I just sit there and look at them. When they see I'm not going to do anything, some of them will even just abandon the CP all together. Once I see them run off, I go ahead and reroll it to something higher and use it for myself.
Stealing CP's with blackhat was cool at first, but I have more fun letting teammates have their own CP's, especially if they're weak CP's that initially drop, or if I can flip their good one's and turn them into crap. It's like "oh snap a teammate CP!" *Rerolls it* "uhh yeah nvm you can have it, it's not even worth attempting to steal that POS KS CP from you." LOL