Line of Liability
The hospital’s invisible line outside the main lobby doors where they wheel their patients to after they are discharged. Utterly nervous that the discharged patient will slip and fall before they exit the hospital, a collective sigh of relief by the hospital lawyers after the patient has been wheeled to the line of liability, steps out of the wheelchair, and walks away.
The hospital staff gingerly helped the discharged patient exit out of the wheelchair and take a step over the Line of Liability. The patient could have collapsed after that and crawled to their car, but it wouldn’t matter; they had crossed the Line of Liability.