The obvious answer - and I've no idea how likely this is - is that as the building cooled overnight the floorboards flexed slightly (this is common) tilting the pile a little. Something fell onto the tub and flipped it against the shower curtain, letting it slide down into the bath and roll to where you found it.
A bit Heath Robinson, but odder things have been documented.
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Date: 2007-12-02 01:20 pm (UTC)A bit Heath Robinson, but odder things have been documented.