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Display MoreLike many buyers, David Olson and his wife got a professional to inspect their dream home before they finally went ahead and purchased it two years ago.
Other than the fact that the stairs at the front were "leaning into the house", the inspection didn't raise any red flags - so the couple finalised the paperwork for the Michigan house.
Earlier this year, the dad-of-three finally got round to demolishing the front stairs when he noticed that something wasn't quite right about the foundation of the building
Speaking to Fox News, David said he started panicking when he discovered random discarded balls underneath the family home,
At first, he genuinely believe the house had been built on "some sort of dumping ground" containing "hazardous material".
But as he smashed the cement into smithereens, David discovered that they were actually BOWLING balls - and the person who had built the house presumably used them to cut back on costs.
Since then, David has gone on to discover 160 balls hiding under the patio too and he's been documenting his progress on the Facebook group The Bowling Ball Guy.
Story and pictures on link above.