Vincent Maher's monster worm post from yesterday inspired me to post this picture of a rain spider nest in my garden that I took in February:

The nest is about the size of a large grapefruit. The spiders that make these nests sometimes come into the house - particularly before a rainstorm. You can see other nests here, and here (with the spiders on them), as well as a close up of a rain spider here.
I am not scared of death by drowning, Joburg taxi drivers or circus clowns but these spiders really freak me out. People have told me that they are harmless but I am not convinced. I found this article at Museums Online South Africa:
These spiders were previously listed as potentially dangerous. After tests where they were induced into biting guinea-pigs it was established that although the guinea-pigs had died within 3 minutes, it had been from shock and not the effects of any venom.
Family Sparassidae - Museums Online
Anything that can scare a guinea pig to death like that deserves some respect and a very wide berth.