By the 1950s, the prevalence of the THINK motto and THINK signs in American business and popular culture had garnered media attention—as well as the notice of cartoonists, satirists and other humorists. Humor rag MAD Magazine was one of several publications to parody IBM’s slogan with the phrase “THIMK.” That gave rise to other words and short phrases that similarly offered humorous contradictions, including “Plan Ahead,” with the last letters of “Ahead” appearing small and cramped.
“In a restroom at IBM’s Watson Center, a supervisor had placed a sign above the sink. It had a single word on it—‘THINK!’ The next day, when he went to the restroom, right below the sign, immediately above the soap dispenser, someone had carefully lettered another sign that read— ‘THOAP!’”
THINK-punning joke that appears widely on joke websites