Emma, Bride Wars
Liv (Kate Hudson) and Emma (Anne Hathaway) are best of friends, until they decide to get married on the same day. Then they become the worst of enemies, spending weeks dyeing one another's hair and skin extreme colors in various sabotage attempts. The pranks culminate on the day of their weddings, both at the Plaza, when a final act of mischief goes awry and Emma literally crashes into Liz's ceremony, tackling her to the ground. While the two end up reuniting for a combined überwedding, the crash itself is pretty uncomfortable.