There are a lot of memorable moments in this one, including this all-time exchange:
Dr.Graves: How'd you find the patient in 72?
Larry: Up on the chandelier.
Dr.Graves: What'd you do for him?
Curly: Nuthin, what'd he ever do for us?
Dr.Graves: WHAT ARE YOU WORKING HERE FOR?
All Three Stooges: For duty and humanity!
Other memorable bits: the hiccuping nurse (Jeanie Roberts), breaking all the glass doors, "calling Dr. Howard, Dr. Fine, Dr. Howard," Billy Gilbert and the parrot, the scene with the telegram messenger (Bobby Callahan), and vandalizing the loud speaker at the end.
MEN IN BLACK was the lone Stooge short appearance of long time, prolific character actor Del Henderson ("Dr. Graves").
"Calling Dr. Howard, Dr. Fine, Dr. Howard," was later turned into a regional hit in the 1980s by the San Francisco band The Finders.