I used to have this top-down sci-fi blaster game - you know, the sort with waves of critters coming at you, power ups to attatch to your ship, that kind of bollocks. Anyway, instead of a the usual backdop you had one of a variety of japanese cartoon schoolgirls whose clothes could be shot off in strategic places until they were down to their undies. Then, you played a second round in which the underwear was shot off and you had to fight a massive boss. If you completed the second round, you were rewarded with a screen cap if the nekkid girl.
Ah, happy days...
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Diamond Geezer owns an example of every Nintendo console