Most Un-Funny Muppet Show...

[The Flying Sheep]

Roy Raogers and Dale Evens.
Lena Horne( sort of)
Tony Randell sort of)

 

[Joggy]

Melissa Manchester is also very unfunny. The writers were obviously running out of ideas and the performers weren't in perfect shape either...

Liberace. Well that show was mostly a concert. Something to please the music lovers...

 

[Drtooth]

I am not sure, but I have doubts about the Julie Andrews episode. I didn't see it, but Sound of Music makes my....CRINGE!!!!!

 

[Fozzie Bear]

I'd have Liberace on MY show...of course, nowadays it'd be a totally different KIND of show, what with him having kicked the bucket a while back.

FOZ

 

[Drtooth]

I am not episode specific here, but I don't think that these are very funny

Goin' to Rio

Lulliby of Broadway (except how Cammilla actually talks)

It's not Easy Being Green (it wasn't ment to be funny, but I have to list it. It makes me sad sometimes.)

The Chickens playing the Piano (Until Stat and Wal's comments)

 

[Thijs]

The most unfunny show i know is the Ben Vereen episode, except for the best "Veterinarian’s Hospital" there is (George-episode).