“Last night I dreamt I ate a ten pound marshmallow. When I woke up, my pillow was gone” is a joke that as been printed on many images.
 
   
TV Tropes 
Marshmallow Dream
“Last night I dreamed that I was eating a giant marshmallow, and when I woke up, my pillow was gone!”
   
Google Books   
Secrets of Successful Humor
By Rusty Wright and Linda Raney Wright
San Bernardino, CA: Here’s Life Publishers
1985
Pg. 182:
He dreamt that all he could eat were marshmallows. In his dream he became so obsessed with marshmallows that he ate more and more and finally began to cram them into his mouth. When he woke up, his pillow was gone.
   
Google Books   
Super Funny School Jokes
By Gene Perret
Illustrated by Sanford Hoffman
New York, NY: Sterling Publishing Company, Inc.
1991
Pg. 84:
I had a dream last night that I was eating this giant marshmallow. When I woke up, my pillow was gone.
     
Google Books   
MitzvahChic:
A New Approach to Hosting a Bar Or Bat Mitzvah that is Meaningful, Hip, Relevant, Fun and Drop-dead Gorgeous
By Gail Anthony Greenberg
MitzvahChic
2003
Pg. 200:
Last night I dreamed 1 ate a ten-pound marshmallow, and when I woke up the pillow was gone. - Tommy Cooper
 
Google Books 
The Biggest Ever Tim Vine Joke Book
By Tim Vine
London, UK: Century
2010
Pg. 134:
I said, last night I dreamt l was eating a large marshmallow. He said, don’t tell me, when you woke up your pillow was gone. i said no, when i woke up one of my large marshmallows was missing.
 
Reddit—Dadjokes
Posted by u/dusty_plug January 12, 2015
Last night I had a dream I was eating a giant marshmallow…
...and when I woke up, my pillow was gone.
 
Reddit—Oneliners
Posted by u/drizzle3 October 17, 2017
Last night I dreamed I ate a ten-pound marshmallow, and when I woke up the pillow was gone.
 
Twitter
Jessa ☻︎
@akssej
Last night I dreamed I ate a ten-pound marshmallow, and when I woke up the pillow was gone.
4:32 PM · Dec 23, 2018·Twitter for iPhone
   
Twitter
High Priest🙏 ⚡
@__Sucre1
I dreamt I was forced to eat a giant marshmallow. When I woke up, my pillow was gone.
I’m so puzzled RN 😕
2:57 AM · Nov 27, 2019·Twitter for Android
 
Twitter
TheEvilMonkey 【ツ】
@th3evilm0nkey
Last night I was dreaming that I was eating a 10 pound marshmallow. When I woke up my pillow was gone! #lol
10:18 AM · Feb 2, 2020·twittbot.net