If they were siblings...

Kirstie Alley and Queen Latifah

The flick: "Big Sisters"

The plot: When a big-time ad exec (Latifah) and a lunch lady (Alley) both get laid off, they decide to open a plus-sized-stripper call service. During a pole-dancing session, they recognize crescent shaped scars on each other, which suggest their hidden past: conjoined twins!