I was in Australia for the 1974 election. It was a bizarre performance. They used preferential voting, and you HAD to express a precise preference for every single candidate or your vote was declared invalid. For the New South Wales Senate, there were 29 candidates chasing 6 seats, if I remember right (including a Nazi candidate given to punching random strangers in the street who everybody called "Skull", and a bunch of obsessed single-issue one-man-and-his-dingo parties). The form looked like an annual results spreadsheet for a large company. It took three weeks to finish the count, mainly because of the state-your-preference-for-everybody checking.

Even that amount of gerrymandering didn't return the government the CIA wanted, so they overthrew it in a coup a year later anyway.