I tried to find a clip from the movie to show you the BEST Muppet song ever, I really couldn't stop laughing. But I couldn't so here's the audio portion, it's still really funny but when combined with the video AND knowing the other types of roles that Jason Segel has played it's even better.
Here is still from the song, it's Jason Segal (Gary) with the Muppet version of himself:
"a Muppet of a man" could you get a more hilarious line from a Muppet movie!?!