have a mind of own
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Related to have a mind of own: A Mind of its Own
have a mind of (one's)/its own
To have the propensity or ability to think, act, or form opinions without outside influence. It is often used (humorously) to describe an inanimate object that cannot be controlled by its owner. I tried to tell him that wasn't the best decision to make under those circumstances, but you know he has a mind of his own, and he did it anyway. I swear, my vacuum has a mind of its own! It turns on in the middle of the night when we're all asleep!
have a mind of one's own
Fig. to be very independent. There is no point in telling her what to do. She has a mind of her own.