Chomping on salty popcorn can work up quite a thirst. And, now, Cinemark Theatres is helping quench your thirst with a FREE refill on large fountain drinks, excluding ICEE and frozen drinks. (To review all of the chain’s concession promos, click here.) The offer is only valid on the same day and you must show your receipt to get the refill. If you didn’t know, AMC Theatres and Regal Cinemas both offer similar refill deals on large soft drinks and popcorn — ask at the concession stand.