 Just as do agent-centered theories, so too do patient-centered theories (such as that forbidding the using of another) seek to explain common intuitions about such classic hypothetical cases as Trolley and Transplant (or Fat Man) (Thomson 1985). In Trolley, a runaway trolley will kill five workers unless diverted to a siding where it will kill one worker. Most people regard it as permissible and perhaps mandatory to switch the trolley to the siding. By contrast, in Transplant, where a surgeon can kill one healthy patient and transplant his organs to five dying patients, thereby saving their lives, the universal reaction is condemnation. (The same is by-and-large true in Fat Man, where the runaway trolley cannot be switched off the main track but can be stopped before reaching the five workers by pushing a fat man into its path, resulting in his death.)