Friday the 13th [1] is one of Hollywood's most enduring horror movie franchises, boasting a whopping 12 films featuring the hockey mask-wearing, machete-wielding villain between 1980 and 2009. Because of that, it should come as no surprise that a lot of screaming has gone down courtesy of Jason Voorhees. Ever wonder exactly how many times unlucky victims have let loose a blood curdling shriek? If so, YouTube user WatsonTheScot [2] is at your service. In a horrifyingly epic supercut, you can see every single freakin' scream that's happened in every single freakin' movie, all within 21 minutes. Prepare to invest in some earplugs.