Spring cleaning sometimes have unexpected results. Its the time when long-lost things are found again, mysteriously at spots that have been picked over several times, without results. And magically, something reappears.
In our case, we found one of our missing fish. We had assumed it was dead and had rapidly decomposed (its happened before) but such was not the case. It had somehow gotten out of the tank and managed to hide under the heater, where the heat mummified it. Now, to reach that point, it had to jump out of a tank, off the table and flop on the floor for a couple of feet.
And no, we don't have a cat who could have "helped" it along.