"Pi" (I keep "A source book" in parentheses to hide the non-mathematical part), L. B. Berggren, J. M. Borwein, P. B. Borwein (Eds.).
"Z=60", Conference in Honor of Doron Zeilberger's 60th Birthday (this, of course, is influenced by one of ma favorite titles "$A=B$").
Removed (following the healthy criticism): "2012", a 2009 American science fiction disaster movie.