I got up this morning, put the dog out for her wee and then went to avail myself of my own facilities. And there's a strange mark on the floor of my bathroom.
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Just two almost-circles (I smeared one with my finger to see what it was). Now, in the normal course of events this wouldn't be noteworthy and I would just assume that I'd put something down on the floor and not noticed. BUT. Yesterday I gave the bathroom a really good clean. The floor was spotless. I appreciated the spotless nature of it when I showered and went to bed - there wasn't a single mark on the floor. I didn't notice it when I got up for a wee at twenty past five (when it would have been light enough to notice, but I admit I was half asleep and might just not have seen). Then, this morning, there it is.
The marks look as though they've been made by the bottom of something, like shampoo bottles, with a kind of greasy residue on them. But I haven't put anything on the floor since it was cleaned. The dog is loose in the house at night, but I can't see how she could have made these marks, and she's not dirty. So. Do I have a phantom goblin who's getting in and dirtying my lovely clean bathroom?
Edited to add: The marks are just in front of and underneath the sink. Approximately where I would stand if I were washing my hands, but a bit more 'underneath' if you see what I mean. You can't easily stand there.