Chandler (Matthew Perry) invokes memories of Three's Company ("Okay, think! What would Jack and Chrissy do?") when Rachel's (Jennifer Aniston) divorcing parents, Sandra (Marlo Thomas) and Leonard (Ron Leibman), show up unexpectedly at her surprise party. To avoid further embarrassment, the party, like an evolving cell, splits in two: one for Sandra, one for Leonard. As if that makes anything better. ~ Hal Erickson, Rovi