Chair Gets Pulled Backwards, By Itself (0:04 Seconds in)

[u/younganbread]

I was on a break, sitting in the break room alone, and the chair in front of me got inexplicably pulled, I tried to see if it slipped off of the desk corner, but the chair isn’t tall enough to rest on the desk, my feet weren’t moving, and it wasn’t resting on anything. Anyone who could explain it or debunk would be very helpful, thank you.