The Make A Wish Foundation's hoping to fulfil a young Melbourne boy's dream "to make lots of new friends by becoming a star on the internet".
Eitan, 7, has been battling leukaemia for four years and is now hoping to let loose by starring in a flash mob with hundreds of people at Federation Square on Wednesday.
The dance set to Justin Timberlake's Can't Stop The Feeling kicks off at 4pm.
"[Eitan] spent lots of time in hospital while other kids were making friends," says the Make A Wish Foundation on its website. "He wants to be famous so he can make other people happy about themselves, and to help everyone have friends."
People are urged to learn the dance or turn up to cheer Eitan on.
Even Metro trains have got behind the cause!
The event can be tracked down online by searching the hashtags #eitanswish #wishforce