Imagine a plastic bag on the floor.
Imaging bending down to pick it up, and it flies away. Ok, that was just wind. You go & try again.
You stand before it for 30 seconds, then as soon as you bend over, it flies away again.
That’s really weird. How many times will this happen to you before you deduce “ok, someone has a little string here & is pulling it whenever I try to reach for it. This object is not moving naturally, it is moving in response to my attention, which means a MIND must be moving it. I thus have to switch to using theory of mind to predict it”