A snowman riddle has been printed on many images.

Q: Why did the snowman pull down his pants?
A: Because he heard/saw the snowblower coming.

“Why did the snowman pull down his pants? He was waiting for the snow blower” was printed in the book Beyond the Mountain (1983) by Elizabeth Arthur. “Why did the snowman pull down his pants? Because he heard the snowblower was coming” was posted on the newsgroup Google Groups: alt.support.divorce on October 23, 1998. “Why did the snowman pull down his pants? Because he saw a snowblower coming” was posted on the newsgroup alt.tv.beavis-n-butthead on December 22, 1998.


Google Books
Beyond the Mountain
By Elizabeth Arthur
New York, NY: Harper & Row
1983
Pg. 58:
Gradually the jokes got bawdier— “Why did the snowman pull down his pants? He was waiting for the snow blower” —and though usually such jokes do not appeal to me, that day everything seemed fine.

Google Groups: alt.support.divorce
Wimps
Daisy
Oct 23, 1998, 3:00:00 AM
(...)
Why did the snowman pull down his pants?
Because he heard the snowblower was coming.

Google Groups: alt.tv.beavis-n-butthead
Why did the snowman pull down his pants?
asa...@my-dejanews.com
Dec 22, 1998, 3:00:00 AM
Because he saw a snowblower coming.

Twitter
PlayboyU.com
@PlayboyU
Why did Frosty the Snowman pull down his pants? http://www.playboyu.com/
1:37 PM · May 29, 2008·Twitter Web Client

Twitter
Dale
@smashtransistor
Q: Why did Frosty the Snowman pull down his pants?
A: Because he saw a snow blower!
3:15 PM · Dec 6, 2008·Twitter Web Client

Twitter
Martim da AztraZeneca
@Martinator
Q. Why did Frosty the Snowman pull down his pants?
A. He heard the snow blower coming.
3:58 PM · Feb 7, 2009·Twitter Web Client

Twitter
Comic Books - The Art of Reading! Memo
@dennissweatt
Q: Why did Frosty the Snowman pull his pants down? A: He heard the snowblower coming.
10:43 PM · Apr 6, 2009·Twitter Web Client

Reddit—Funny
Posted by u/JimboMacism February 18, 2015
Why did the snowman pull down his pants?
Because he heard the snowblower coming!
Hah!

Reddit—Jokes
Posted by u/xpottybreakx June 1, 2015
Why did the snowman pull down his pants?
Because he saw the snowblower coming

Reddit—Jokes
Posted by u/barwhalis November 18, 2017
Why did the snowman pull down his pants?
The snow blower was coming

Reddit—Jokes
Posted by u/JENESAISPAS722 December 20, 2017
Why did the snowman pull down his pants?
Because he saw the snow blower coming

Reddit—Jokes
Posted by u/spatter4 March 10, 2019
Why did the snowman pull down his pants?
Because he saw the snow blower coming.

Reddit—3amjokes
Posted by u/RyanHeath87 November 24, 2021
Why did the snowman pull down his pants?
Because he heard the snowblower was coming by.