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Muppet
Cultural Icon
Muppets are well-loved characters from a famous TV show, so calling something a 'Muppet' can show affection. 
Not An Insult
Referring to the original show characters, 'Muppet' is not meant to offend, but rather to reference a lovable figure. 
Global Recognition
Muppets are known worldwide, but their popularity can vary, so consider if your audience will understand the reference. 