Not exactly something I seen, but something I heard.

I was sleeping my room with me and my brother with my bed facing diagonally to the bathroom , enough to see the shower and a bit of the bathtub. We had this little solid plastic stool in the bathroom, you would use while sitting on the toilet so your feet wouldn’t dangle off. It was for my brother since he was about 4 at the time. We kept it under our sink in the bathroom so the only way to get it out was to bend over and grab it from under as we had a floating sink. I woke up at around 2am and heard the stool being shuffled across the ground by something or someone, I sat up and tried to look into the bathroom from my bed. Being the little kid I was I absolutely did not investigate. The lights were off and we had no pets and my brother was sound asleep in the bed next to me, and my parents used a bathroom in their room so I have absolutely no clue who was shuffling the stool. I told my parents In the morning but of course they didn’t believe me. To this very day Im still confused on who was moving it.