The best part about a haunted house is never knowing where the next scare is coming from. No matter how many you've experienced, there's still a nervous anticipation followed by a startle when something jumps out of the shadows. It's like the first drop on a roller coaster, only it happens every time you turn a corner.

The best part about a haunted house is never knowing where the next scare is coming from. No matter how many you've experienced, there's still a nervous anticipation followed by a startle when something jumps out of the shadows. It's like the first drop on a roller coaster, only it happens every time you turn a corner.

TerrorFest, a 20,000-square-foot tour of horrors in the Brewery District, has found a way to intensify the impending fright: 3-D.

Sure, adding "third-dimension" paint to live-action scenarios may seem like overkill, but TerrorFest creators promise their experience is the "Avatar" of haunted houses.

"I guarantee you're never going to see anything like this," said owner Keith Korner. "And it's really scary."

TerrorFest consists of two haunted labyrinths - the traditional Butcher's Realm and the new Brewery Butcher in 3-D. Both get a lot of out common fears such as being in claustrophobic spaces and complete darkness.

The scare tactics used in Butcher's Realm - traditional blood-covered psychos and axe murders popping out and chasing you through tight hallways - are enough to make anyone stop in their tracks as they navigate through macabre asylums, morgues and human slaughterhouses.

Popping on a pair of 3-D glasses makes the Brewery Butcher more colorful and visually stimulating, and more terrifying at times.

It's like 3-D on acid, with fluorescent paint covering walls and sets while blacklights offer the only illumination. Flat objects seem to pop out of walls and coffins, while actual three-dimensional objects play games with your depth perception.

The best part is you're unaware of which monsters are set pieces and which are actors covered in 3-D paint, causing something of a "chameleon effect." Your mind begins to play tricks on you after only a few minutes inside.

A few particularly awesome visual highlights in 3-D - a long hallway of glowing skulls that feels like a first-person shooter video game and a vertigo tunnel that distorts your equilibrium - are also frighteningly fun.

A $20 ticket gets you into both tours, which take about 30 minutes to complete. Purchasing a VIP ticket means you can jump to the front of the line.