When she gets a flat tire, through a comedy of errors, Bonnie ends up locked in the trunk of her car until Jill comes to rescue her. This shouldn't have happened, though, since all modern cars have a pull-release cord inside just in case something like this happens.
When Bonnie is in the trunk, the supports holding it up fail for no reason and the trunk closes. Even if this happened, all modern cars have an emergency trunk release handle on the roof of the trunk so that nobody can be trapped in there.