The local police brought a prisoner in to have a complaint checked
out. During his stay, he asked to use the restroom. The officer
escorted him to the patient restroom and stood watch right outside
the door. He was in there for quite some time and nobody was
suspicious until radiology came through the door saying that they
heard swearing coming from the ceiling down their hall. Upon
entering the restroom, they found a ceiling tile missing and no
prisoner. Sure enough, he was in the ceiling in the radiology hallway.
He had run into a solid structure in the ceiling and had no where to
go.

It took another 30 minutes to ferret him out.