By Kate Ward
Updated July 07, 2009 at 12:00 PM EDT

I now present to you a special countdown: The Top 20 reasons why I was so sad this past weekend. Ready? Okay, here goes…. Reason 20: I ate a Twinkie for the first time in 15 years, and it wasn’t nearly as good as I remembered. Reason 19: Actually, scratch that. There’s no reason to share the rest of the countdown, since reasons 19-1 are: Because Casey Kasem officially said goodbye to his American Top 20. (The radio icon had been hosting an abridged version of American Top 40 after he left the original program in 2004.)

I know. Tragic, right? Especially since the 77-year-old radio host left his classic program with barely any fanfare. So why is he leaving? Though I immediately blamed those meddlesome kids — after all, the man famously voiced Scooby-Doo‘s Shaggy — it appears as though the host is leaving to pursue other projects, like a memoir. Impressive, considering most men his age retire to the golf course, or to the couch to watch re-runs of Matlock. But not Casey. And would we expect any less? The workaholic lent his voice to American Top 20‘s program for 39 freakin’ years! And I was lucky enough to have been listening for at least 14, when the host schooled me on the backgrounds of the likes of Shawn Colvin, Everclear, and the Backstreet Boys.

So thank you, Casey Kasem, for your hard work all these years! And I bid you a very appreciative, albeit sad, adieu. I will eat a Scooby snack in your honor.

Let’s give him his due, PopWatchers! What’s your favorite Casey Kasem memory?

addCredit(“Lee Celano/Reuters/Landov”)