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You don't know that houses can't move. Absence of a proof does not imply impossibility.
Sounds ridiculous (esp. for windows / houses) but I think it actually shows where Occam's Razor comes to the rescue: When deciding what to believe, you should consider how many assumptions either model of the world would have to include in order to explain your observations.
Turns you don't need to look for indisputable mathematically rigorous proofs, you just need to find the best model.
All houses can move, if enough wind is blowing
Therefore it is wind that makes cars go.
Sometimes houses move because of wind, sometimes they move because of earth quakes. There's gotta be a common element, x, between wind and earth quakes that this can be reduced to, so that we can say "cars and houses move because of x".
Sometimes houses move because they've been loaded onto or built as a part of a vehicle.