Muppet movies are events for several reasons, but one of the most important is that you need to watch to catch all of the human celebrities who have signed up to be part of the insanity. Sometimes it's a cameo and sometimes it's a featured role, but more often than not something special happens when a big star crosses paths with the Muppets.

SHOW NOTES

• Steve Martin in "The Muppet Movie" (Joint Choice)
• Zack Galifinakis in "The Muppets" and "Muppets Most Wanted" (Michael's Choice)
• John Cleese in "The Great Muppet Caper" (Richard's Choice)
• Michael Caine in "A Muppet Christmas Carol (Michael's Choice)
• Joan Rivers in "The Muppets Take Manhattan" (Joint Choice)
• Dave Grohl in "The Muppets" (Richard's Choice)