UPDATE:
Due to what happened on the Gamespot contest recently, I'm changing my mind about Einstein/Hitler, so I might as well discard Charles Barkley/Michael Jordan completely as well. I suggest you guys don't nominate real-life characters, unless you have a strong argument to support them. FYI, I'm hesitant about Little Mac/Mike Tyson and that sort of stuff (either way, that match doesn't really have that much of a "joke" label in the first place).
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Nominate Left Pong Paddle vs. Right Pong Paddle for the Rivalry Contest!