Viking kittens singing Electric Six's Gaybar song. Giant peas, spongmonkeys and inflated gerbils. Surreal and scary stuff - but it's all really rathergood.com. In the author's own words: "a load of stuff by Joel Veitch that will probably crush your will to live". Go there - unless you're a child or easily offended.
They feature music by Mr Scruff, but that's not the only reason why they're sublime: Weebl and Bob!
b3ta.com is a comedy web site featuring digitally manipulated pictures of varying artistic quality and links to many other strange and silly things on the 'net (warning - not really a site for the family, if you see what I mean).
One of the best Flash animations featured at SFDT is Xiao Xiao No. 3 - an all action fight scene, with sound!
An online comic strip by Jon Rosenberg about two blokes, a goat, a satanic chicken and a psychotic programmer...
An old favourite comic strip by Bill Watterson: 
Some Canadian by the name of Darren has come up with a fantastic collection of weird documentation. Go see it - it will baffle, amuse and confuse - or your money back.
Do not feed these animals... 
The world famous Hampster Dance has been revamped into Hampsterdance2!