TIL There is a study where pictures were put on shelves in hospitals and they could only be seen from the ceiling to find out if people with out-of-body experiences really was out of their bodies. If so they could tell afterward what was on the pictures.

http://www.dailygrail.com/Spirit-World/2013/1/Have-Scientists-Found-Proof-We-Leave-Our-Bodies-Nobodys-Telling-Just-Yet