SOURCE: On November.13, 2010 unsuspecting shoppers got a big surprise while enjoying their lunch. Over 100 participants in this awesome Christmas Flash Mob. This flash mob was organized by http://www.AlphabetPhotography.com to wish everyone a very Merry Christmas!
Personally, what I found equally impressive was the beautiful display of public (and explicitly Christian) religiosity — and the complete absence of disgruntled atheist loons protesting it. 😉
HT: The Anchoress