Thanks to GamePro for its article discussing formerly in-development videogames which never actually got released
. Some of the more unconventional include Data East's Tattoo Assassins
("2D video-captured fighters, whose tattoos come to life and whack on other players. Characters included a Nancy Kerrigan clone and a giant running hot dog"
), Sega's Virtua Hamster
("...[involving] polygonal rodents with rocket packs and skateboards swooshing through a huge hamster habitrail, collecting popcorn kernels to spit at enemies"
), and Runandgun!'s partially resurrected
Duelin' Firemen! ("...[an FMV] game about singing, dancing firemen [starring Rudy Ray Moore]."