The Twenty-four Hour Animation Contest, commonly abbreviated to THAC, is an annual brickfilming contest with a time limit of exactly 24 hours. Participants must create an entire brickfilm from scratch (with the exception of set building, music design, and sound effects) within 24 hours. Originally hosted on Brickfilms.com, THAC is now hosted on and officially run by the website Bricks In Motion. The contest was started by David West in 2005 and has been run by various other individuals since 2008. THAC has been run by Nathan Wells since its twelfth installment.