For most of these events, I hadn't even been aware of what was happening until after I found out why it happened. My friends and I had gone bowling (let's call them Pink, Red, White, Blue, and Purple) for Purple's birthday. After all our fun and games, a few days later Blue messages me regarding her wallet. And Purple informs me that her belongings have been shifting around and moving when she didn't move any of her belongings.
Retracing all our steps, I looked everywhere that Blue's wallet could be. After giving up and taking a break, Blue messages me again asking about the wallet. One of the places I had checked was in the pocket on the back of the driver's seat in the car (which had everything but a wallet in it).
Being the person I am, I agreed to check one more time (I should mention my family had been gone at work, and roommate in the house and there's no way anyone would have moved the wallet). This time, after I went back to look in the car, there was the wallet in plain sight in the back pocket of the driver's seat. On top of all the other things.
Then, after a bit (a few days or maybe a week, I'm not good at keeping track of time) my friend who's a medium and I got to hang out. That's when the one who had been moving our stuff came out, and I learned this mischievous spirit was messing with me because he thought it would be fun.
My friend tends to let almost any spirit appear through them, so when T (using this as the spirit's name) came about, he admitted he had been moving our belongings. When I questioned about the wallet, he admitted it was him. Ever since I met him a month before this at bowling, he's been following me.
To this day he still sticks around because he thinks it's entertaining and he likes me. Out of all the spirits I've encountered, he's one of my favorites.