You may never heard of Comical Machine Gun Joe, because it has a lot going against it. The arcade game was Japan-only, on the Master System's Sega Card only, with a 10-minute gameplay loop.
Still, they packed a lot of weirdness in this puppy. The single screen shooter has jumps, power-up pigs, mini-men shackles and a few bizarre maps. This game didn't care; it just wanted to have some fun.