A shocking footage has surfaced online which appears to show a crazed girl forcing her boyfriend to make a public apology for flirting with other women on Instagram while she holds a knife to his throat. The terrified young man apologizes in front of camera to stop his demented girlfriend from slicing his neck with an enormous knife. The distressing video of the unidentified American couple has recently emerged online. It is unknown who the couple are or if it has been staged. See the shocking footage after the cut.