Addams Family - motorized bookcase
Fish Tales - fishing reel rotating ball lock and flapping fish topper.
AC/DC - interactive bell (it just swings but its satisfying to hit when you hear the sounds and see the animation)
White Water - Bigfoot diverts ball and head spins.
Twilight Zone - mini PF with magnet flippers, motorized clock
Fireball, etc - Zipper flippers
Bride of Pin*Bot - ball locking rotating face.
Cue Ball Wizard - motorized working cue stick
LotR/GOT - sword ball lock
Water World - tanker ship ball lock
BSD - mist ball
TOTAN - Lamp (not motorized but satisfying to spin when you hear the sounds and see the animation)
Championship Pub - punching bag/boxer
Mechs don't have to be fancy to be fun, just clever and nicely integrated. But as already mentioned, they take time and money to design and they add to BOM and build time. Only competition will improve things.
