This was asked by 1000 students at the University of Oxford. There are two near-identical pictures.

You must find 3 differences. If you can find all three then you are part of an elite group of individuals. This has been tested on a sampling of 1000 students at the U of O, and only 19 people out of 1000 found the three. All three differences do exist. It took me a while and I was only able to find 2 before I gave up..good thing the answers are highlighted after..
http://members.home.nl/saen/Special/Zoeken.swf (have volume on because the sounds in the background MAY possibly be one of the clues....)

someone try this. its odd

I can't even access the link alas.

I found all three but it took me awhile.

Christ!!!!!

I take it we're supposed to find them before the she-devil pops up and screams at us????

This test sucks!!!!!!!