What does 'Were you born in a field?' mean?

My dad used this idiom a lot when I was a child, to point out to me that I had left the door open after I'd come or gone through it. I presume it has to do with the idea that an animal in a field wouldn't not bother to shut a gate behind them.
('Were you born in a barn?' is an alternative form.)

Idioms similar to 'Were you born in a field?'

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