In the beginning of the movie when Julia Roberts

is throwing Brad Pitt out she is leaning over

the top throwing his things down and yelling at

him for taking another job. If you look you

can see a necklace on over her top. After a few

back and forth scenes between Brad and Julia

her necklace is down inside her top. Later on

it back outside her top. It is not falling

down inside her top as it is too long. And once

if it did fall inside it is too long to fall

back out. And no bending over would not cause

it to fall back out because as I have said

it is too long of a necklace to do that.