For just one day (April 1, of course) a UK merchant added to their terms and conditions which every on-line purchaser is required to accept:
…you agree to grant Us a non transferable option to claim, for now and for ever more, your immortal soul. Should We wish to exercise this option, you agree to surrender your immortal soul, and any claim you may have on it, within 5 (five) working days of receiving written notification…we reserve the right to serve such notice in 6 (six) foot high letters of fire, however we can accept no liability for any loss or damage caused by such an act.
Purchasers were offered an opt-out checkbox, but apparently only 12% checked it.
Of course nobody reads the terms and conditions. (Actually, I have met one person who claims to; I didn’t ask him whether he had actually purchased anything on-line.) On more than one occasion I’ve found the link to terms and conditions didn’t work, or made no sense, have notified the vendor and usually received an updated link or a correction.