The second part of his study involved an offended hospital challenging Rosenhan to send pseudopatients to its facility, whom its staff would then detect. Rosenhan agreed and in the following weeks out of 193 new patients the staff identified 41 as potential pseudopatients, with 19 of these receiving suspicion from at least 1 psychiatrist and 1 other staff member. In fact Rosenhan had sent no one to the hospital.

Conducting an important scientific experiment, teaching a painful lesson to those who challenge your authority, and showing your good sense of humor. Without any work whatsoever. It must have felt good.