Only one record...

[zanla]

With 1000+ ukulele players (to include my Lady, my clone, and my clone's friend) we managed to make a new Hawaii record for the most ukulele players, playing the same song, at the same time.  Unfortunately, we needed 1500+ players to break the world record.

http://www.kitv.com/slideshow/news/29561098/detail.html

It was still a blast, and the family got a chance to learn an ukulele song with me.  Much fun had by all.