...or a heart attack inducer for sure! Damn these spider stories are gettin' worse and worse! These gigantic crawlers just freak Uke's ass right out! Ya go wandering around in a damn rain forest in South America, ya deserve ta shit yourself!

Entomologist Piotr Naskrecki stumbled upon a Goliath Bird-Eating tarantula, he wrote on his photo blog last week. The spider is the largest in the world and can weigh up to 6 oz.

Giant spiders have long been reserved for nightmares, myths and Harry Potter.

But a scientist found a huge spider in real life, after a puppy-sized one surprised him on a nighttime walk in the Guyana Rainforest a few years ago.

Entomologist Piotr Naskrecki was on the hunt for insects when he "heard the rustle of an animal running," the scientist at the Museum of Comparative Zoology at Harvard University wrote on his photo blog last week.

At first, Naskrecki thought the animal was a possum or a rat. Instead, he found the largest spider in the Guinness Book of World Records: the South American Goliath birdeater.

These spiders really are worthy of the record: their leg span can reach almost a foot and they can weigh more than 6 oz.

And because of its size, it's "probably the only spider in the world that makes noise as it walks," which Naskrecki compares to the sound of horse's hooves.

"For all the arachnophobes out there this is probably a good excuse to pave over large swaths of the Amazonian rainforest, but for the rest of us this species is one of the biodiversity's crown jewels," Naskrecki said.

To protect itself, the spider rubs its hind legs against its abdomen to release microscopic hairs with barbs.

"'Oh how cute!', I thought when I first saw the adorable behavior," Naskrecki wrote. "Until a cloud of urticating hair hit my eyeballs, and made me itch and cry for several days," Naskrecki wrote.

The spiders venom is not poisonous to humans, but it can inflict puncture wounds, Naskrecki said.

For people who want to see the spider without getting that close, Naskrecki captured and brought the Guyana spider to the museum at Harvard, WTSP 10 News reported.