This has been floating around the internet for awhile so you may have seen this already...but if not...can you figure it out?
http://mr-31238.mr.valuehost.co.uk/assets/Flash/psychic.swf
I'm no genius but the answer is always a multiple of 9 from 9-81 and these are the symbols that you will always come up with even though they all appear to be refreshed.
All sums are a multiple of nine and all multiples of nine in the list share the same symbol.
The only way to not have your mind read by the page is to have exceptionally poor math skills.
Edit: Just saw the ph03nix said it first.
Lemme see if I can pick the correct emoticon for this situation...