One girl(A) gets mad at another girl(B) for inviting a guy to their girls night..........20 seconds later the same girl(A) is about to stop the car to see how cute some random guy is.
The ending was a bit silly. They may think that they got away with murder, but there is still a witness. If Holly ever breaks up with Ben, they're toast. Plus how fragile Mel is, she might just tell herself.