I was ambling through the YouTube terms and conditions earlier today when I spotted this:
In any case, you affirm that you are over the age of 13, as the YouTube Website is not intended for children under 13. If you are under 13 years of age, then please do not use the YouTube Website. There are lots of other great web sites for you. Talk to your parents about what sites are appropriate for you.
This occurs at the end of clause 12 (in a 14 clause set of terms), after the better part of almost 4000 words of legal mumbo jumbo. If the reader really is under 13 is it reasonable to expect them to be aware of these sentences?
Brendan Scott's Weblog 