Methods: In 2000 an unidentified hospital staff member placed a 24 oz plastic flask of Nestle Coffeemate (Hazelnut flavor) into a nursing station refrigerator on the 8th floor of Local Hospital. A regional neurologist has casually noted the movements of the flask of proto-dairy product at intermittent intervals over time while scavenging for Diet Coke. The flask has been consistently identified over time by it's original expiration date (February, 2002) stamped on the rim.
Findings: The Coffeemate bottle has now been in the refrigerator for over 10 years. Careful observation (okay, lifting and shaking it a little from time-to-time) showed that its weight gradually decreased in the first several months of it's presence, then stabilized. While weight can vary depending on local gravity, the Earth's gravitational force has not changed substantially during this time, nor has the hospital been relocated to a planet with lesser gravity. The contents have not been directly inspected by the author during this time.
The bottle has remained on the same shelf (center shelf, refrigerator door) since its original placement. Its specific location on the shelf has varied (sometimes next to the Ranch dressing, at other times between the ketchup and mustard, and once briefly near a bottle of banana-based ketchup that a Filipino traveling nurse brought). Overall its location has been reasonably predictable within the limitations of the Heisenberg Uncertainty Principle and Schrodinger's cat.
Results: It's still there.
Discussion: There have been a number of postulates to explain this sort of object persistence. While local changes in Brownian kinetics or gravity are possible, the most likely cause of the flask's roughly unchanged location is attributable to the nature of Homo Sapiens. This local species appears to be disinterested in removing objects that are not the direct property of a given individual. Therefore, it's likely that only the specific animal which originally placed the Coffeemate on the shelf will be inclined to retrieve it, regardless of its current condition.
Its persistence, in spite of clearly being empty for several years, is likely due to one or more of the following possibilities:
1. The original owner no longer works at the hospital, or at least not on that floor.
2. The original owner has forgotten it's theirs, and therefore isn't touching it.
3. People are lazy.
It should be noted that item #3 is actually a unifying theorem for #1 & #2.
In conclusion, the author would like to note that I didn't put it there either, and so I ain't touching the freakin' bottle. The last time I tried to do something nice like that I almost got my hand chewed off by a rabid oncology nurse.