The Lottery

[Jackalope]

You can turn roulette into a positive EV game if you can predict a small slice of the wheel where the ball will not land before the croupier waves off further betting. Machines can do this

This would fall under the category of "cheating", not a system.

and some people claim to be able to do this in there head(but I have serious doubts about that).

Given how the game works, I'm skeptical in the extreme with the respect to those claims.