27. The Hissing Cat
I work in a cardiovascular surgical ICU. We have a lot of fucked up people (both physically and mentally) that come through our unit.
We had a stretch of nights were each corner room of our unit (it is a perfect square) reported seeing a cat walking around.
Not a friendly cat either, apparently. The thing was hissing at them.
The accounts were so similar to each other we actually spent probably a half hour looking around for a cat and then had security/plan ops come look as well.
No cat was ever seen or found. Two of those four patients coded the next day.