Although Happy Days never explained what happened to Chuck Cunningham onscreen, there is a real-life explanation for his sudden disappearance between seasons. Very few shows can boast that they added a phrase to the pop culture lexicon, and even fewer can lay claim to two different phrases. One of the most famous American sitcoms of all time, Happy Days, managed exactly this feat with the terms “Jump the Shark” and “Chuck Cunningham syndrome.”
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