I just remembered a great little number Fozzie did with Richard Hunt's Snowman in 'The Muppet Family Christmas':
: Ah, Christmas, time for Santa Clause and his eight fancy rein-bear.
Snowman: Actually, that's reindeer.
: No, that's snow, darling!
And another one:
: Hey, that's pretty good harmony for a snowman!
Snowman: Actually, I'm a Snewman!
: What's a Snewman?
Snowman: Nothing's a-snew, man, what's a-snew with you?