The Iron Monger takes it. Iron Man 2 premiered in the Number One spot at the box office this weekend with $133.6 Million. A Nightmare on Elm Street (2010) was Second with $9.1 Million. How to Train Your Dragon was Third with $6.7 Million for $201 Million so far. Date Night was Fourth with $5.3 Million. The Back-Up Plan was Fifth with $4.2 Million. Furry Vengeance, Clash of the Titans (2010), Death at a Funeral (2010), The Losers, and Babies rounded out the top ten respectively.