shh! don t let too many know whether you re going bananas dancing in a new jersey grocery store or university library in spain. make my wish come true reporter: or at the vancouver airport. santa claus is coming to town reporter: the canadian flash mob that set the standard lal lieua, hallelujah reporter: was organized by a company called alphabet photography. they meant it send it out to customers as an electronic holiday greeting. jennifer blakely dreamed it up. this is a vision i had in my head while i was having a shower one day singing in the shower. so to see it unfold i was actually in tears almost. reporter: they got permission from mall management but only security knew what was going on when a community chorus and some music students started singing. hallelujah, hallelujah reporter: i love the guy holding up the wet floor sign. he s my favorite. which one of you wants to be the