I haven’t and I don’t think I ever will.
First I don’t have anything to prove to anyone.
As a child and also as a teenager I witnessed poltergeist activity.
It wasn’t something anyone or myself consciously caused though.
Using ceremonial magick to cause objects to move isn’t something a lot of people would waste their time on.
If you have the power to cause objects to fly around the room using ceremonial magick is it likely you would be using your power for far greater things.
Seems to me like you have doubt that magick is real and that people can cause reality to shift by the use of magick.
Remember this isn’t Harry Potter like magick we are talking about here.
Often people use magick to cause possible realities to become very probable realities and line things up in their life that greatly benefit them or someone else.
One of the greatest road blocks for magicians is doubting you have the power to manifest your desires.
A warning to you Wednesday, if you try and call on spirits and get them to do something just to prove to you they exist or have the power to affect this world it could backfire on you in a bad way. There are plenty of spirits out there that would teach you a harsh lesson if you attempt to do so.
Saying you were successful in evoking them that is, which you probably wouldn’t be if you have the level of doubt in the reality of such things that it appears you have.