sychobrew: *Dies, drops grenade, BOOM!!!, gets one more kill before re-spawning*
ZOMG! WHaT A NUB! I BET U USE p_90 AND NUBTOOB!!1!!
Is that the appropriate response?
But now that I think about it... What if there was a perk that blew up your body to damage players around you to possibly get one more kill? In the later levels of The Conduit enemy Trust soldiers' armor would do that. You would hear this "beep beep beep," and then BOOM! I don't think the blast radius and the time it took to explode was too bad, but the whole idea still seems a bit too much like Martyrdom to me, which I never liked. On top of that, who knows how lag might affect this perk, but it could work.
Remember those in prison as if you were their fellow prisoners, and those who are mistreated as if you yourselves were suffering. Hebrew 13:3 (NIV)
Doesn't have to be a kill. Could be an assist (i.e. when the guy goes to use the booby trapped weapon, it explodes causing damage and you may get an assist for a partial kill, which is likely because he would be left without a weapon to fight back).
I don't think tricking an opponent is a cheap kill.