I'm kind of hoping it's the second time that's the charm.
This is a jackhammer. It’s a tool that’s normally used for demolition rather than construction. It turns out, however, that when our friends poured concrete into the holes that the trench drains were set into, the concrete didn’t behave as it should. Rather than give the drains a cozy spot to settle into, it floated said drains to the surface, above the level of the floor tile. That’s why the photo above looks like our kitchen floor has been prepped for minor surgery. It reminds me of a melanoma I had once, apart from the jackhammer.