Don't forget, funny stuff also counts.
Super Mario Land is extremely messed up.
First you go to Egypt or whatever, and blow up a quacking sphinx inside of a pyramid.
Then you get abducted by aliens, and dropped off at a swamp, where you later go underwater in a randomly appearing submarine to destroy a giant seahorse that quacks.
Later, you go to Easter Island and destroy a bunch of moai guys.
Even more later, you arrive in Japan\China and start killing all of the children there.
While in Japan\China, you take off into the skies in a helicopter plane thing that randomly appears out of nowhere. You around in random directions, killing a bunch of birds, then you find a weird castle thing in the sky, so you decide to go inside and go through a maze-like tunnel.
Later, you arrive in a room, you find a cloud that quacks and shoots birds, you kill it. Then, Link comes out of nowhere in a spaceship, and tries to kill you. You kill Link, and you find the real daisy, she kisses you and you fly off in a spaceship while a (freakishly awesome) Megaman styled remix of the SMB theme plays in the background.