[Can anyone offer a link or a confirmation of this wonderful story, please? I've searched and, so far, found nothing.]
Just heard a report on BBC Radio Four's Today programme about a Russian man called (I think) Yakov who had (as usual) been presented with a long impenetrable set of Terms and Conditions when he sought to borrow money from a bank.
Allegedly, he scanned the details and amended some of them before signing and returning them to the bank, who also accepted and signed the modified document. Unfortunately for them, the bank apparently did not read right through the document did not notice that it specified that Yakov was not required to pay any interest, and was entitled to borrow just as much money as he needed.
And best of all, when the bank subsequently objected and took Yakov to court, the court found in favour of him and against the bank.
If this is true - brilliant!