If "fun" means getting up close and personal with those preparing your food, then BD's and Benihana are probably your best choices (in addition to approximately 4,387 sushi places in the Bethesda/Rockville area).
For a fun, unique setting, you might want to look at Clyde's Tower Oaks Lodge. http://tinyurl.com/2lykxs
Live flamenco music at La Tasca (call for details):
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