It's probably dumb luck but I seem to have the power to Jinx people
My Brother was playing GT5 and the online host was about to change the track but he wanted to finish a lap. I said he'll be sent back to the lobby just before he crossed the line, and he did
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Every single time in Mario Party when I play with friends. I'll say stuff like "You'll get a 6", "You're going to lose all your stars"... and they happen.
In MK8, I dominate a race with my brother chilling in second and sometimes I'll imagine hime getting 3 Red Shells and he does. Also applies when I think about someone using a Blue Shell.
etc.
I also seem to have the biggest luck EVER in games since I've never lost a Game of Mario Party unless I go easy on my opponents.