Jump The Shark.

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According to this "hard news" site. It was 30 yrs ago yesterday when the term "Jump the Shark" came into being:

This term comes from the infamous moment on September 20, 1977, when "The Fonz" from "Happy Days" donned his famous leather jacket, went water skiing, and jumped a shark on his skis. TV critics and anyone with taste or brains realized this was the moment the show had finally killed itself; the moment the original premise of the show was so betrayed, its vision having veered so off course, that there was no point going on. And it's used now to describe the moment that anything betrays its original purpose. And what do you know, it was thirty years ago to the day. Freaky, man.

Anybody know? Is this true?