There's an episode of South Park where buried in the terms and agreement of iTunes, you agreed that Apple could forcibly make you into a human centipede. See: 
In the real world could this happen? They did agree to the terms and conditions which did include that.
In the real world, the contract could not be enforced, as being unconscionable. See Williams v. Walker-Thomas Furniture Company, 350 F.2d 445. This, from the ruling, seems particularly applicable to TOS conditions:
Did each party to the contract, considering his obvious education or lack of it, have a reasonable opportunity to understand the terms of the contract, or were the important terms hidden in a maze of fine print and minimized by deceptive sales practices
