Duckman gets placed in a mental institution after pleading temporary insanity to a charge of public ranting. He likes the strict regimentation of the institution (compared to the anarchy and chaos of outside the institution) so much that he decides to have himself permanently committed. Cornfed comes to rescue Duckman from the institution, but is to late as he has already been given shock treatment. Luckily Cornfed has a book on brain surgery and gets Duckman back to 'normal'.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
After an incredibly bad day, Duckman simply wants to make it to Charles and Mambo's birthday dinner, but gets pushed too far by a dry cleaner. His ranting in the street over the inconveniences in life caused by the uncaring ways of society (without wearing a starched collar) gets him arrested and committed to a state mental hospital for thirty days, where he settles into the routine and decides to stay, forcing Cornfed to break him out.