Faeries love to play pranks. They will take an object they anticipate you’ll need and you won’t find it where you left it. Then later on you’ll find it back in that same place you looked!
One example: You might have two pairs of gloves and find that both left hands are missing for awhile.
Another: They like to 'almost' show themselves and get your attention in the corner of your eye – and when you turn – you see nothing there. This is similar to the prank of tapping someone on the opposite shoulder to have them look in the wrong direction. (This was originally a faery prank that humans have since borrowed.)
There are others forms of Faery pranks– but hopefully you will never be the object of their mischief! Just appreciate them for themselves.