That agreement has never been tested in court in the US, to my knowledge, but I've heard legal opinion (mostly in the UK, but not exclusively) that suggests "shrink wrap" agreements are unenforcable.

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And you, to whom adversity has dealt the final blow
With smiling [faces] lyin' to ye' everywhere ye' go
Turn to, and put out all your strength of arm and heart and brain
And like the Mary Ellen Carter, rise again.