Earthbound spirits still care about the planet, which is why haunted houses feature lights that suddenly go out and showers that shut off after three minutes. Feel the phantom power with today's Groupon: for $29, you get two general-admission all-pass tickets with fast-pass upgrades at Trail of Fear in Lawton (an $80 value).

Trail of Fear's spectacles spook and awe visitors seeking Halloween thrills. All-pass tickets with fast-pass upgrades grant full access and line skipping on trips through attractions such as the Trail of Fear, whose scare scenes and winding pathways intertwine, mingling with the fearsomely monikered pyramid of doom and its visiting cousin, the molehill of mild discomfort. The Cirque de Morte's circus maze encapsulates dastardly pursuits by off performers, and the Voodoo Bayou's eerie and gruesome scenes send chills radiating through an atmosphere not recommended for children under 10. Jaw-dropping presentations by Hellzapoppin Sideshow Revue showcase talents such as sword swallowing and glass eating, as devious performers demonstrate impressive feats and their real-world applications.