My older brothers had a metal football table that you carefully placed your players onto in their positions. The players had magnets on the bottoms. When all the players were lined up you turned the power on and the table would vibrate. The vibration caused the players to move randomly. I think it was fun for 15 or so minutes the 1st time. Oh, the vibrating metal was also very noisy.
How about the hot plates and aluminum molds where you poured liquid plastic from a squeeze bottle into them and baked them until hard. There was an edible version and a glow in the dark version also. My brother made spiders, skeletons, shrunken heads etc... Can't have anything like that now!