Recently: I've been playing Trials of Osiris every weekend since HoW went live on Destiny. Whereas in normal Crucible matches, I try to find a balance between having fun and winning - Due to the things at stake on Trials of Osiris, I unashamedly slap on all my try-hard gear of overpowered weapons and armor and proceed.
Hey, it's not my fault the Thorn is so stupidly overpowered and in dire need of a nerf that it dominates PvP. But as long as it is, I will use it to win... Sorrynotsorry
But as far as every other MP game goes, doing whatever it takes to win? I'd say some of my most "shameful" actions would have to be to lame it out.
Back in the old days of CS when I used to play casually, I was playing on some Hostage Rescue map where the Terrorists were inside a bank, and the CT's would spawn from the outside only having a single doorway to enter the bank. Normally due to the size of the map, the CT's would enter the doorway quickly and fan out through the map utilizing the various pathways. But this CT team instead all purchased sniper rifles and camped OUTSIDE the building. My less-than-intelligent Terrorist team would blindly charge out the one doorway to the outside and be greeted with a dozen sniper rifle shots to the face.
After a few rounds of this happening, I finally stopped and realized something "Wait a minute, the CT team has to come in here to rescue these hostages. I don't have to go outside, they have to come in here! Fuck that! I'm staying inside!" so after my team predictably ran outside and got gunned down. I plopped my ass down behind a cabinet right next to the door and didn't budge an inch.
4 agonizing minutes crawled by of silence before the announcer alerted us that 10 minutes were left in the round. Then I suddenly heard the patter of about a dozen footsteps charging towards the door when the idiots realized they were about to forfeit the round for playing like assholes. They all charged in through the one doorway where they were greeted by my smoke grenade and my HMG. I didn't even finish killing all of them before the round ended. After which I got booted.
It felt good to out-lame the lamers.
In fighting games I'm not shy about employing the same tactic. I remember playing Injustice against a Wonder Woman while I was using Lobo. Lobo, a generally slow and short range character. And Wonder Woman who is highly mobile, has long range normals, and excellent spacing tools.
I'd won a few matches, and then WW began to use a strategy of backing away from me repeatedly, waiting for me to close the distance, and mess me up with her spacing and long range normals. After losing some rounds to this strategy, I began to employ one of my own. The match began as it usually did with me taking away of huge chunk of her health before she began to back away. And I responded by... doing absolutely nothing. I had the life-lead, so if she wants to back away like that, then screw it. I'll just sit right here and take the match via clock.
About 40 seconds went by of both of us sitting at full screen before it eventually dawned on this player that he'd lose if he didn't do anything. So he charged back towards me in a panic, to which I responded by beating her senseless for the next 10 seconds before the round ended and I won. The guy plugged his mic in after that to yell at me for being a "******". We played for another round, where the same exact thing happened (Hey, I wanna fight. But if he wants to back off constantly when I have the life lead, then that ain't my fault lol.) We sat at opposite ends of the screen from each other while he yelled at me for 40 seconds for not coming to get him, where he eventually charged back in and got stomped on again. Then he quit.
Again, it feels good to out-lame the lamers.