Assumeing this is not a joke,the cut is too high off the ground to make sense for a spy movie style break-in. The bottom of the circle is like 5 feet off the ground and too small for someone tall enough to easily step in to the house that way, it would be more sensible to just smash the window at that point. Judging by the pebel spot in the bottom left of the Crack (it looks like a feint white circle) and the multitude of oak trees on the property I think it's more likely that an acorn fell on the window durring a windy day, or that durring the house renovations it got hit by some type of debris/shrapnel