Teenage Mutant Ninja Turtles NES vs. Famicom : Intro Weirdness
13The first half of this video shows the normal NES intro sequence for Teenage Mutant Ninja Turtles which plays if you do not press start on the title screen. The second half shows the intro for the Famicom version of the game, 激亀忍者伝, but when the individual turtles are shown using their weapons, things can get a little weird...
The Famicom version normally plays out this sequence just like the NES version but will accept A & B button inputs during this sequence, so you can make the turtles jump and use their weapons beyond what the program does at this point. The directional pad is not functional during this sequence but Konami fixed the sequence for the NES version (released a month later) so that none of the buttons except start would be recognized.