Doing stuff like quitting a mercs game at 149/150 to cheat someone out of their new high score, or joining someone's professional difficulty game just to lob grenades at them right when they're about to beat a tough segment or boss
Not really. The most I've done is turn around and shot an acid round at somebody because they kept shotgunning the grasshopper J'avo when I was trying, to set them up for a coup de grace. They'd been doing it for most of the match, I was getting annoyed and I already had the acid rounds out so I shot them in an attempt to get them to back off. It didn't work.
Well, this one time I waited until my parnter was in dying status on story mode, and proceeded to teabag him for several seconds, only to not revive him, not before using a first aid spray on myself when I had full HP, teabagging him/her some-more and finally shooting him with the bear commander Grenade launcher attatchment as he lay helpless, defenseless, on the floor, like a little beach.
I recieved a hate mail some-time after the attack. Lols were had.
Well, if you count Agent Hunt as trolling, I recently obtained the 4-star "Brutal Hunter" title, which means I have killed at least 200 agents.
The ones that probably hate me the most are those who I killed just as they were about to leave the area where you can hunt them. I recently killed someone on board the bus on Leon's chapter 1, just before the chapter ended :D .
Then there are those rookies that don't know how to counter or evade which I end up grabbing non-stop like 4 times in a row or more with a Bloodshot until they finally drop dead.
Finally there's those who try to hoard FAS, which I annoy by either not coming out of the respawn point, which they can't reach, or by only attacking with ranged attacks, like from outside the Gun shop or from the unreachable areas in the Catacombs, so they can never take any FAS I may drop upon death.
HELL Yea..let me tell you what I do...I join someone game and I soon as I start I pick any explosive and start attacking them...pretty funny how they get caught off guard and then when they crawling for there life I watch them beg...then I deliver the final blow...and quit