I was thinking it would be fun to release GoodCoin and EvilCoin just to see which one becomes more valuable.

Or: JesusCoin, AllahCoin, BuddhaCoin, VishnuCoin, AtheistCoin, etc. Who will have the most followers?!?

Or get national with: USACoin, ChinaCoin, JapanCoin, EUCoin, etc.

The coin author would set a date to evaluate the final results and declare a winner. That would also reinforce that these coins are not meant to have any long-term value so noobs are not tempted to buy and hoard them.