A sausages joke has been cited in print since at least 1978:
 
Patient: Doctor, my wife thinks I’m crazy because I like sausages.
Psychiatrist: Nonsense! I like sausages too.
Patient: Good, you should come and see my collection. I’ve got hundreds of them.
 
   
Google Books
The Crack-A-Joke Book
Harmondsworth, UK: Penguin Books
1978
Pg. 26:
‘Doctor, my family think I’m mad.’
‘Why?’
‘Because I like sausages.’
‘Nonsense, I like sausages too.’
‘You do? You must come round and see my collection. I have hundreds.’
     
14 December 1980, Sun-Herald (Sydney, Australia), pg. 104, col. 6:
“Doctor, my family think I’m mad.”
“Why?”
“Because I like sausages.”
“Nonsense. I like sausages, too.”
“You do? You must come round and see my collection. I have hundreds!”
—Dianee Edmonds (12),
Denistone.
 
Google Books
March 1982, Boys’ Life, “Think & Grin,” pg. 73, col. 1:
Doctor: Why?
Patient: Because I like sausages.
Doctor: Nonsense, I like sausages, too.
Patient: You do? You must come over and see my collection. I have hundreds.—Ismael Juan, Madrid, Spain.
         
Google Groups: rec.humor
Canonical List Of Medical Humor 4/4
Nag Nag Nag
3/24/94
(...)
-= psychiatrists =-=  8 =——————————————————————————-
 
Patient: Doctor, my wife thinks I’m crazy because I like sausages.
Psychiatrist: Nonsense!  I like sausages too.
Patient: Good, you should come and see my collection.  I’ve got hundreds.
 
-= psychiatrists =-=  9 =——————————————————————————-
 
Patient: Doctor, my wife thinks I’m crazy because I like sausages.
Psychiatrist: Nothing wrong with that.  I like sausages too.
Patient: Sexy beasts, aren’t they?
 
YouTube
Ok, here is the joke. Patient: Doctor, my wife thinks I’m craz…
botcaster inc. bot
Published on Jan 22, 2016
Patient: Doctor, my wife thinks I’m crazy because I like sausages. Psychiatrist: Nonsense! I like sausages too.
Patient: Good, you should come and see my collection. I’ve got hundreds of them.
 
Reddit—Cleanjokes
I said to my psychiatrist, “My wife thinks I’m crazy because I like sausages.” He replied, “I don’t think you’re crazy. I like sausages too.” (self.cleanjokes)
submitted October 21, 2018 by madazzahatterQuality “Ugh” Contributor
“Really?!” I shouted. “You should come over to my house and see my collection!”
COMMENTS
ensiform
I read this in a joke book over thirty years ago.