Due to the presence of IRV in my country, most of the time I'd vote Greens, so them winning my seat wouldn't be super likely....and of course they won't win government.
As for who I preferenced.....I put Labor ahead of Liberal.....the Liberals won the only election I voted in, but Labor won the seat. So....half a win, perhaps.
This is basically my situation, except I've voted in three elections where Labor has won the seat, and the Liberals the election.
I've also voted in two by-elections where I gave my preferences to Labor and they won the seat, so I suppose that's two unambiguous victories.