During the production of Closer (2004), Natalie Portman gave co-star Julia Roberts a necklace bearing the inscription "Cunt." Contrary to some reports, the gift was nothing personal. It was simply a playful reference to Julia's character's potty mouth.
Some time later, at the end of the shoot, Julia returned the favor by presenting Natalie with another necklace. Its inscription? "Lil' Cunt."