A few months ago I had to empty and move a storage rack (as part of a general rearrangement of that room).
When I moved the rack away from the wall, I was surprised to find lying on the floor behind it a 375-ml bottle of pear wine that I bottled in 2004. Obviously, the bottle had somehow slipped out of a lower level of the rack and fallen to the floor without breaking and without being noticed.
The wine looked perfectly clear, the cork was solid, no evidence of seeping. I finally could stand it no longer and pulled the cork -- pure vinegar!