At times it seems that almost every day there is some new fantastic picture that comes in by e-mail. Of course many of them are clever Photoshop fakes, but a surprising number are not.
Take these two fun quizes and see if you can spot the computer generated fakes from the real pictures.
First, the Urban Legends site has a quiz containing many of the famous e-mailed pictures. Secondly, software company Alias asks you to work out which pictures are generated by computer.
I got 74% in the Urban Legends quiz, but only managed 5 out of 10 in the second.