In the 2011 movie David Tennant played Las Vegas showman and vampire expert Peter Vincent.
In this video Charley (Anton Yelchin) finds that Peter will join him after all, even if they are walking into a trap.
Warning this video contains strong language and the video is short in accordance with the copyright holder's wishes.
Apologies if this video does not play in your country. Many thanks to the YouTube account Just Tennant for uploading the video.
Fright Night section of DavidTennantOnTwitter.com