Quoted from Rarehero:One thing the most of the most beloved pinball machines have is HUMOR. Humor is sorely lacking in most modern games, as they're all based on action/epic type licenses. Muppets are FUNNY. Well, maybe not the new TV show that was cancelled...that blew...but watch the original show or the original Muppet Movie. Even Muppets Most Wanted is very funny. If you had the Henson people writing custom dialog and doing new live action Muppet clips for the display, that could be insanely entertaining. You could have the two old hecklers, Statler and Waldorf as little animatronic Muppet toys in a balcony on the playfield, watching the ball and making fun of you the whole time you play.
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I'm not keen on the muppets but do agree with you that humour is lacking from newer games and it would be great to see more of it.