1940..."The Strange Case of Dr. Kildare."   (Don't try  this at home kids)

In this Turner Classic Movies film, the good doc recklessly cures a
schizophrenic with a massive dose of insulin, takes him into a coma over a 5
hour period and snatches him from the jaws of death with a big dose of
glucose through an I.V., followed by two jelly sandwiches and a half liter
of milk. The patient's temperature was 86 F. just before the glucose I.V.

Here's a link to this bizarre practice from the Time Magazine archives Sept.
18, 1944.

http://www.time.com/time/magazine/printout/0,8816,796721,00.html

Here's another link: scroll down to "insulin shock."

http://schizophreniatreatments.bravehost.com/history.html

Yet another link from that quaint period

http://www.priory.com/homol/insulin.htm/