According to tv guide the best episode ever was chuckles bites dust which aired oct 25 1975 as on what series?

That's a very interesting question! You're referencing a famous internet joke, specifically a fictional episode title from the classic sitcom "Happy Days." The episode "Chuckles Bites the Dust" is a fabricated episode name often used as an example of an absurd or unrealistic TV episode title.

There's no actual episode of "Happy Days" called "Chuckles Bites the Dust." This humorous phrase has become a cultural touchstone for mocking outlandish or fake television program descriptions.

The phrase is often used in online forums and social media as a way to poke fun at unrealistic plotlines or exaggerated claims.