Equal parts horror and satire the short film “Spat” uses the tumultuous nature of relationships as the backdrop for an apocalyptic Zombie outbreak. Based on the world created in the Web comic, “The Portland Underground,” the film chronicles the final, very chaotic night in the relationship of former couple Jessica Miller and Tommy Kline. All appears well in Jessica’s world as she entertains new boyfriend Eric Murray in her cozy apartment late one night. However, when Tommy shows up drunk and unannounced, all of that comes crumbling down. After a brief argument, the situation with Tommy takes a bazaar turn for the worse, and Jessica is left with a serious mess on her hands.