Collection of most terrible pieces of code I stumbled upon.

instantlyEvaluateThis.java

//  This class would be understandable if the #call() method wasn't instantly called by the only method actually using it...
public interface ICrashReportDetail<V> extends Callable<V> {}

whyUseEnum.java

public class WorldType {
    public static final WorldType[] WORLD_TYPES = new WorldType[16];
    public static final WorldType DEFAULT = (new WorldType(0, "default", 1)).setVersioned();
    public static final WorldType FLAT = new WorldType(1, "flat");
    public static final WorldType LARGE_BIOMES = new WorldType(2, "largeBiomes");
    public static final WorldType AMPLIFIED = (new WorldType(3, "amplified")).setNotificationData();
    public static final WorldType CUSTOMIZED = new WorldType(4, "customized");
    public static final WorldType DEBUG_WORLD = new WorldType(5, "debug_all_block_states");
    public static final WorldType DEFAULT_1_1 = (new WorldType(8, "default_1_1", 0)).setCanBeCreated(false);
}