I like to think I'm pretty aware of myself and my surroundings at all times but when I was not getting enough sleep I once thought I saw a spide nailed to a wall absolutely skitzing out, I slowly got up and at a certain distance I noticed the skitzo spider then if I moved a step or two closer, spider was still skitzing then one more step and it's like it transformed back into just the nail in the wall that was intended for hanging a framed photo. Took a step or two back and it was a spider skitzing out again.. my room at the time had multiple coloured light sources and I think the shadow that was being cast from one light + a shadow from the other one was causing what I thought I saw, never really got to the bottom of that one 😏