“Time flies when you throw your watch”

“Time flies” means that time passes quickly. Time doesn’t literally “fly,” but there are jokes.
 
“Time flies when you throw your watch” was posted on the newsgroup alt.humor.jewish on July 13, 2004. “Time flies when you’re throwing watches” was posted on Twitter by Natasha J on July 4, 2010.
   
“Why did the man throw a clock out the window?”/“To see time fly” and “Time flies when you throw away calendars” are similar “time” riddles.
     
   
Google Groups: alt.humor.jewish
Oneliners
Renee
7/13/04
(...)
Time flies when you throw your watch.
     
Twitter   
Eph®aïm
@eph0382
time flies when you throw your watch
9:32 AM - 28 Jul 2009
   
Twitter
FunnyOneLiners
@Funnyoneliners
Time flies when you throw your watch.
12:51 PM - 24 Sep 2009
 
Twitter
Natasha J
@SilentPirate
Time flies when you’re throwing watches
7:18 PM - 4 Jul 2010
   
Twitter
Rachel ☺
@x_Rachel_xO
Time flies when you’re throwing watches.
5:50 PM - 19 Jan 2011
   
Twitter
♏️debs
@dorydebby
Time flies when you’re throwing watches.
6:11 PM - 19 Jan 2011 from Isle of Anglesey, Wales
 
Google Books
More One Liners, Jokes and Gags
Compiled by Grant Tucker
London, UK: Biteback Publishing
2013
Pg. ?:
Time flies when you’re throwing watches.
     
1 October 2013, The Advertiser (Adelaide, Australia), “The Last Word” by Marty Smith, pg. 18:
JUST A THOUGHT
Time flies when you’re throwing watches.
 
Reddit—Stupid Quotes
Time flies when you throw your watch in the air. (self.StupidQuotes)
submitted December 3, 2017 by VReznovvV
 
Reddit—Shower Thoughts
Time flies when you’re throwing watches
submitted February 24, 2018 by Brinksterrr