What is the mash potato mishap?

There is no widely recognized event or incident referred to as the "mash potato mishap."

It's possible that:

* You're thinking of a specific incident you heard about: If you remember any details (like where it happened, who was involved, etc.), you could try searching for it online.

* It's a personal anecdote: Perhaps you or someone you know experienced a funny or unfortunate incident involving mashed potatoes.

* It's a fictional event: It could be a story from a book, movie, or TV show.

Can you provide more context or details about what you're looking for?