“People go to Weight Watchers to learn their lessens”

“People go to Weight Watchers to learn their lessens” is a pun on “learn their lessons.” The dieting joke joke was cited in the newsgroup rec.humor in 1996.
 
     
Google Groups: rec.humor
DIET (PUTDOWNS)
Nancy Carson
3/27/96
(...)
People go to Weight Watchers to learn their lessens.
 
Google Groups: alt.tasteless.jokes
Thoughts on diets
Joke List
1/17/99
(...)
People go to Weight Watchers to learn their lessens.
   
The Hindu (India)
February 9, 2008
Wave the green flag to health
(...)
People go to Weight Watchers to learn their lessens.
 
Twitter
EZ Diet
‏@myezdiet
http://bit.ly/ezDiet People go to Weight Watchers to learn their lessens. (catch the spelling of “lessens”. Get it?)
5:03 PM - 3 Apr 2010
 
Twitter
Fitness Viking
‏@FitnessViking
People go to Weight Watchers to learn their lessens.�
8:00 PM - 24 Feb 2015