From Wilson Gray and Bert Vaux on Facebook, this New Yorker cartoon by Danny Shanahan:
A pun on get help, turning on who plays the benefactee role in help-getting: the drowning man (‘get help for me’), or Lassie (‘get help for yourself’).
As a bonus, another Shanahan pun cartoon:
This one is simpler: school ‘educational institution’ vs. school ‘group of fish’.
