I went to find the registry of a friend and I found this on their wedding website:
"We are asking every guest to learn the Cupid Shuffle before the reception, it is an easy dance. The DJ will invite everyone on to the dance floor to dance the Cupid Shuffle and we would like everyone to join in. Check out the link below!"
I shouldn't be surprised since this is the same person who asked every one to wear a black dress and wear their hair up for her bridal shower...