Amid evil cackles, flashing lights and a towering ghost pumpkin shivering and growling, a demented clown crept up behind a group of haunted house enthusiasts, waiting for just the right moment to jump from the shadows. The creature growled. The men and women screamed. The gimmick was executed according to Amy Hollaman’s plan. If you go 13th Floor Haunted House is at 3400 E.