In Italy, it has happened in the past that you had a result like Party A: 45%, Party B: 45%, Party C: 10%. Party C forms a coalition with Party A to form a gov

In Italy, it has happened in the past that you had a result like Party A: 45%, Party B: 45%, Party C: 10%. Party C forms a coalition with Party A to form a government, but constantly bargains for 'more' than their 10% would merit - because otherwise, they pull their support and you have new elections. They eventually did and IIRC, Berlusconi got voted in again...