The Empire Strikes Back wasn't exactly a breeze to film, especially the scenes on Dagobah. It took up to four hours to shoot two lines of dialogue in the hot, humid muck. Sometimes, they would even have to wear masks to stave off the nausea caused by the foggy, gassy confines of Yoda's backyard. Plus, getting the Yoda puppet to work properly was a technical nightmare.

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With frustrations running high, Yoda operator Frank Oz decided that a surprise was in order. Hamill had just delivered the line "I followed my feelings," when Miss Piggy popped up next to him from out of nowhere and declared "Feelings? Ya wanna know about feelings? Get behind this couch and I'll show ya feelings, ya little runt."

Lucasfilm

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"I've got a bad feeling in my pants."

Oz happened to also be the puppeteer responsible for numerous Muppets and Sesame Street characters, and he decided to have a few of his co-workers visit him on set. While it was rather scandalous to have Miss Piggy shamelessly flirt with Luke Skywalker right in front of her green beau, Hamill got over the awkwardness and sang a duet of "Feelings" with Miss Piggy. Sadly, their musical number wasn't filmed -- after all, it was simply a semi-spontaneous moment to perk up the folks on set. Though we do have some photos ...