David Olson was going to demolish the steps to his back door. But as he chipped away, he found a slew of bowling balls in various colors and weights buried under the house. The Michigan man found a total of 160 bowling balls while renovating his home, and was bewildered at how and why they ended up there. Now, he finally found the answer as to why they were there in the first place. Turns out, they came from a now-closed bowling-ball factory in the town, and were used in the house’s foundation.