Earl Gibson III, FilmMagic
First and foremost: Don't argue while driving. The clip centers on two characters -- Monica's close pal and her boyfriend -- and when the pair have words in their automobile, it leads to a devastating accident.
As the visuals open, Monica's friend is being wheeled into the hospital on a gurney. Her boyfriend, meanwhile, seems to have escaped with just a gnarly facial wound.
When Monica shows up, she reveals her contempt for the boyfriend, getting all up in his grill and implying that his infidelity -- confirmed later on when incriminating photos show up on his iPhone -- are to blame for the mishap.
Just when things can't get any sadder, we learn the couple has a kid. Then things get sadder still, as the injured woman dies, leaving behind a waiting room filled with grieving loved ones.
The overarching lesson: Cheating is bad news -- be happy with what you've got.