LEFT FIELD (baseball) The defensive position in the outfield to the left. (idiomatic) An unexpected, bizarre, or unwatched source
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“Why do you think that way…You are soo weird.” Clari would say, or from the kids the much more succinct “Dad, you’re dum!”
This would happen when I would let my mind wander down some corridor of thought-imagination, and I would chuckle at the new idea at the end of the hall, and I would be asked what I was laughing at …I would often get that kind of response, or maybe just a quiet pause before they carried on with whatever
or the affectionate “Dad your dum”
They may be dum but they are my thoughts and you have a right to them, even if they are from left field.