I do remember a positive experience that I had in Overwatch. There used to be this dude who must have been very close in skill level to me because Blizzard's matchmaking used to pair us a lot. Either on the same team, or against each other. He would start every match with typing in the group text "The earth is flat. You have been and are being lied to." If he was on voice comms, he would say it. Every time. One day for whatever reason I requested that we team up. Or possibly he did; either way we ended up grouped together. While in a lobby waiting for teams to fill out one day I asked him something like "why do you say that every time?" or "are you trolling or do you actually believe that?" He said of course he didn't believe it, but if he managed to get a guy to bite on the other team we would almost always win. When I started paying attention, I will be damned if he wasn't right.