This page will help you mix a text in a special way. Each word is mixed separately, but first and last letter are preserved. The inner letters are then shuffled.
One cannot claim that the result can be read without problems (as some do). But the result is easier to read than one would expect.
Enter some text in the box (any European language), click [Mix the text], and see if you (or your friend) can read it.
Read more about it here: http://www.mrc-cbu.cam.ac.uk/people/matt.davis/Cmabridge/