Imagine you bought a new car, got it home and found a "terms of use" document in the glove box, which you supposedly agree to if you drive the car. It says you can't open the hood, and if they find out you did, they'll remotely disable the car.
I'll quit posting on this now. But read this Wikipedia article about one-sided "standard form" contracts:
http://en.wikipedia.org/wiki/Standard_form_contract
It says this:
"Often the document being signed is not the full contract; the purchaser is told that the rest of the terms are in another location. This reduces the likelihood of the terms being read and in some situations, such as software license agreements, can only be read after they have been notionally accepted by purchasing the good and opening the box. These contracts are typically not enforced, since common law dictates that all terms of a contract must be disclosed before the contract is executed."