Based on:
Hunter vs. hunter
Titan vs. titan
Warlock vs. warlock
I think killing a bladedancer with golden gun is my favorite. Never bring a knife to a gun fight!
Edit: poll #5 meant to say self reviving ON someone who nova bombed you and killing them with scorch.
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Best shutdowns I've gotten: Pull up my bubble in front of a nova bombing Warlock. He pops my bubble, then I continuously punch his face in. See a Defender Titan in his bubble with two of his friends. I jump in, throw a Lighting Grenade in the middle of a bubble, and jump right out. Everyone runs out of the people and I shotgun/melee them to death, later got killed by a self-rez'ed Warlock.