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Doing subfloor prep is typically a good thing, but on this job, it ended up with a monstrous surprise. The memory of it is still so bad, in fact, that the installer in question wishes to remain anonymous.
The job was on the first floor of an apartment complex. The installer had checked the slab's flatness carefully and calculated how much leveling compound he would need to complete the subfloor prep. When he actually mixed it and started pouring it on the floor, however, he realized he was using much more compound than he had expected to. He kept mixing more and pouring it onto the floor, and it seemed to be practically disappearing. Then he had a terrible thought and decided to walk downstairs, which was the lower level parking ramp. Directly underneath his floor was a Mercedes—covered in leveling compound. Turns out, he hadn't dammed up the perimeter of the job, and the compound had found a hole in the floor underneath the wall—a hole that, unfortunatley, happened to be directly over a resident's luxury wheels.