Why are people scared of spiders?

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We get those spiders in South Africa too, we call them Red Romans.

http://www.seds.org/~spider/spider/Spider/arachnid.html

A friend of mine went out on a field trip and they had to spend a few nights in a thatched bungalow. All night he could hear the tapping of spider legs on the rafters above and every now and then there would be a hard thump as one landed on him on his bed. They apparently jump off the rafters trying to get moths.

Wouldn't like to get the specimen in the photo on my head. He looks to be about 20cm long.

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Lol @ T-Bone shaped cutout!

Ha ha, I can guarantee you that I would be sleeping in the bungalow only if I could have full chainmail armour and a motorcycle helmet with the visor TAPED shut.

Imagine the sound as the spider hits the visor....Thok!!
and then the feverish scrabble of spiny legs across the helmet as he scurries away, no doubt going back up to the rafters for more fun...