“Did you hear that joke about the butter?” (joke)

Butter has this popular pun:
 
Q: Have you heard the joke about the butter?
A: I butter not tell you. It might spread!!
 
The joke has been cited in print since at least 2008. “Did you hear that joke about the butter? Everyone’s spreading it” is a popular form of the joke that was cited on Twitter on January 3, 2012.
 
     
ElaKiri Community
Funny Sinhala and English SMS
bashi
11-26-2008, 09:54 PM
(...)
Q: Have you heard the joke about the butter? A: I butter not tell you, It might spread!!
 
Twitter
Amanda Gebhardt
‏@agebhardt
Q: Have you heard the joke about the butter? A: I butter not tell you, It might spread!!
3:50 PM - 28 Sep 2009
 
Twitter
Aadarsh Prakash
‏@___aadarsh___
@funnyoneliners Have u heard d joke abt d butter?A:I butter not tell u,It might spread!
7:19 AM - 19 Jan 2010
 
Twitter
Bobby S.W.F.C.
‏@bobbyengland
Got this joke about butter to share with ya!
But please don’t go spreading it guys !!
8:01 AM - 23 Nov 2010
 
Twitter
Willie B. Hardigan
‏@Will_Koz
I have a great joke about peanut butter but I can’t tell anyone cuz I don’t want them spreading it around! @OfficialLyndiJo @Dat_Kneegrow
11:48 AM - 26 Jul 2011
 
Twitter
Lame Jokes
‏@LamestJokes
Did you hear that joke about the butter? Everyone’s spreading it. #LJ
6:28 AM - 3 Jan 2012
 
Twitter
PUNS
‏@WowSoPunny
Did you hear that joke about the butter?
Everyone’s spreading it.
1:36 PM - 29 Apr 2015