...snip...
Build an arcade cabinet with an Amiga inside. Possibly a cocktail cabinet for Deluxe Galaga among others and a 2-player Stunt Car Racer cabinet.
Plenty of other stuff too 
I put an A500 mobo in an arcade cabinet once, wired it to the JAMMA connector. I still needed the keyboard and mouse for a few things but it was pretty good. Lots of Amiga games "feel" like arcade games too.
It was worth doing just to play Speedball2 in 2 player mode, good way to really thrash some joysticks.
