Me and my best friend have experienced a phenomenon 2 times which we fail to explain properly. Personaly I'm leaning towards dimensional shifts.
A couple of years ago I had placed a bread package with bread in it in the window at my flat, my best friend was present, we turned around talking, and after some time turned back to the window and the bread was gone, and it hasn't come back since.
About 3 weeks ago it happened again, this time in his apartment. His baseball cap went missing, we searched everywhere but it was gone. I jokingly said it went into the 7th dimension, he laughed as he was on the toilet while I did some searching, I was looking at the floor under the area where the cap usually hangs, then it just appeared about 1cm above ground and landed with a small thud, I quickly called him over and I was just stunned to have witnessed this. I told him to touch it and he did, he said it felt like normal, and it was room temperatured, so wherever it went there was no temperature difference it seems, he smelled it and said it smelled a bit off. We had not been taking drugs of any kind, nor alcohol. What are your thoughts?