Hey Pandas, What Is Your Most Creepy Experience With A Toy?

My young niece had one of those little balls that wiggles and lights up, and it started going off by itself. Flipped the switch (which was already off, btw) back on and then off again thinking it was some kind of glitch. Nope. Still going off. Went to pull the batteries out, only two are in there (it takes 4). Turns out my sil poached the other two to put in the tv remote. So how was it lighting up still? No frickin idea. We spent over an hour asking yes or no questions and seemingly getting answers via the ball going off or not. Not sure if we summoned a demon, or her cheap toy just had some bad wiring.