EG: I went through every ounce of plumbing up there yesterday. Turned on all appliances that used water simultaneously, tried different combos of shutoff valves, jiggled fixtures, inspected caulking, the works. Could not reproduce so much as a drop of water. There were clearly two entry points of water based on inspection of the subfloor. Based on how much water the GF saw there, coupled with the location of it, there were only four possible options.
1) Toilet overflow - ruled out as the toilet and subfloor next to/behind it was bone dry, and GF witnessed junior flush.
2) Bathtub fixture - ruled out by inspecting all fixtures, jiggling, turning, you name it, coupled with water damage reports that moisture sensors were showing the tub was dry behind the 1/4 round moulding.
3) Shower stall - ruled out as fixtures were on the opposite side of the wall with no moisture readings, staining didn't correlate with fixture side from below, shower hadn't been used since that morning, so no explanation as to where a sudden onrush of water came from.
4) Child - armed with a plethora of bath toys
Interrogation followed this general line of questioning:
Toilet flush? No
Splashing? No
Toys? Mermaid only, "did not use the blue cup at all" without being prompted
Look of nervousness, lip biting
Reaffirmation of mermaid only? Might have used the blue cup with the giraffe, but did not spill any
More nervousness, clear signs of panic
Question about type of play with giraffe? Make him walk instead of float
How does one make giraffe walk? Needed to make water go down...
Hammer of defeat raising
Did you maybe spill a lit bit of water on the floor with the blue cup? Yes, but only three cups...
Eyes welling
Are you sure it was only three cups, or were you maybe not really counting? Admission of not really counting, followed by apologetic hysteria of "I didn't mean to lie!"
Gavel of defeat slams. Case closed.