this just happened a few days ago - i had a wet hand towel drapped over the side of the bathtub and there was also a bottle of bath gel sitting just a few inches away from it .
ivwas alone in the bathroom, none of he animals were in there with me & the door was closed .
i was standing at the sink about 3 ft away from the tub washing my hands and i heard a quiet little "plunk" noise in the tub. so i kinda leaned sideways to look and see right there, laying in the tub are both the towel & the botttle of shower gel..