“Yo mama is so dumb, she put a quarter in a parking meter and waited for a gumball”

Parking meters—at least the old ones—accept quarters, and there’s a “yo mama” insult joke:
 
“Yo mama’s so stupid, she put a quarter in a parking meter and waited for a gumball to come out.”
 
The joke has been cited in print since at least August 1997, when it was in a list of “Yo Momma so stupid…” jokes on the newsgroup rec.humor.
 
 
Google Groups: rec.humor
Yo Momma so stupid…
MSpie6969
8/22/97
(...)
Yo mama so stupid she put a quarter in a parking meter and she yelled “were’s my gumball.”
 
Google Groups: alt.tasteless.jokes
Yo Mama is So Stupid
GP
9/22/98
(...)
Yo mama’s so stupid, she put a quarter in a parking meter and waited for a gumball to come out.
 
Google Groups: cz.comp.amiga
Yo’ momma’s so ugly, she frightened away both the beauty and the beast!
Ivo Janacek
2/25/98
Yo’ momma’s so stupid, she put a quarter in a parking meter and waited for a gumball to come out!
 
Twitter
YoMommatv
‏@YoMommatv
Yo Momma is so stupid, she put a quarter in a parking meter and waited for a gumball to come out!
11:09 AM - 31 Oct 2007
   
Twitter
Kris de Keijzer
‏@kris1988
@Pascal86 Yo mama is so dumb she put a quarter in a parking meter and said, “Hey where’s my gumball?”
10:14 AM - 19 Mar 2009
 
YouTube
Jokes - Yo momma is so stupid, she put a quarter in a parking meter and said, “Where’s my gumball?”
jokesus
Published on Aug 11, 2015
Joke :
Yo momma is so stupid, she put a quarter in a parking meter and said, “Where’s my gumball?”
 
Twitter
Stick Or Truth
‏@StickOrTruth
Yo momma’s so dumb she put a quarter in a parking meter and waited for a gumball to come out #jokes
1:45 AM - 16 Jun 2016