I am not sure how many know of this new fantastic internet meme, the Harlem Shake. If not, it is very easy for everyone to join in; you don't need any choreography or even know how to dance!
<< Here is an example of the meme.
It would be AWESOME if we could get cosplayers at an anime convention to do this! I am not sure when or where at the convention, but please post if your interested/have any suggestions!