In honor of the ‘Rings’ movie premiere this week, ‘Shadowhunters’ star Kat McNamara pulled an epic prank on two of her costars.

Dominic Sherwood and Isaiah Mustafa, who play Jace Wayland and Luke Garroway on Freeform’s Shadowhunters, thought that they were watching an early preview of the new movie Rings.

Little did they know, their co-star Kat McNamara was waiting for them behind the television. During the screening of Rings, McNamara (dressed as Samara Morgan from the movie) ran out from under the screen toward Sherwood and Mustafa. After a few seconds of screaming and full-out terror, she revealed herself as the ultimate prankster, but Sherwood made certain that he had the final scare.

Watch the full video of the prank below:

Freeform announced last night that if the Rings prank video is shared 50,000 times, they will release a deleted scene from S2E6! You can help unlock the clip by either sharing this video on the Shadowhunters Facebook page, or by tweeting a link and including the hashtag #ShadowhuntersRings.

If you think McNamara went too far with the prank — don’t be fooled! Sherwood and Mustafa are the KINGS of scaring her on set. We’ve been waiting patiently for McNamara to finally plot her revenge, and judging by the looks on the guys’ faces, we think she finally redeemed herself.

Don’t believe us? Check out this video from when Sherwood actually locked McNamara in her trailer on set so that he could scare her when she stepped outside:

Or this time, when Sherwood scared her simply because he was asked to by a fan during a live chat. This scare was a little too easy… but still, leave Kat alone!

Check out the video below:

And Isaiah Mustafa isn’t innocent in all of this either. Here, he carefully planned his attack on both McNamara AND Sherwood, and both of their reactions are priceless.

Yep, Mustafa definitely deserved to be a Rings video prank victim too…

Shadowhunters returns with an all new episode, “The Iron Sisters,” on Monday at 8/7c on Freeform and the Freeform App.