The idea that all the people locked up in mental hospitals are sane while all the people walking about are mad is merely a literary cliche, put about by people who should be locked up. I assure you there is not much in it. Taken as a whole, the sane are out there the sick are in here. For example you are in here because you have delusions that sane people are put in mental hospitals.
Between "just desserts" and "tragic irony" we are given quite a lot of scope for our particular talent. Generally speaking, things have gone about as far as they can possibly go when things have got about as bad as they reasonably get.
Tom Stoppard (1937 -)
Source: Player in Rosencrantz and Guildenstern are Dead