Simply tweeting the intention is an empty gesture. How about setting up a publically auditable escrow account with the recipient set to be HBO/Time Warner. Deposit $20 (or whatever is fair compensation) and then go ahead an acquire a copy of the video. That's what I thought this would be when I saw "Take my money, HBO": a realizable offer of money.
Is there any legal precedent for this, i.e. attempting to pay for a product or service, being ignored and then paying and taking it anyway?