ghosts. yes.
i was in my room one day searching for my phone.  i looked everywhere and i checked my bed, in my sheets and everything.  i laid down and looked under my bed but all i saw was a yellow lacrosse ball.  i got up, walked out of my room and was about to walk downstairs when my brother asked to borrow my phone charger.  turned around, walked back to my room and bent down to unplug my charger and BAM my phone was sitting right next to the lax ball.
not very scary but it literally happened over the course of 30 seconds.  the lax ball is yellow and my phone is jet black, i checked angles and there is no way the phone could've been behind the ball when i initially looked.  the phone was also towards the middle of my bed, so i doubt it couldve fallen out of my sheets when i went out of the room.  even so, i was never more than 5 feet from the door so i would've heard it (my floor is cork not carpet).  to this day it gives me chills thinking about it, i freaked the fuck out.