Dear God ....
Personally, I think that people here are thinking small,
what about projecting life insurance advertisements to people on life support machines that disables the function of the machine until they agree ....
Dial 999 on your phone and have to agree to 10% off voucher at Starbucks before you can connect ...
Start a presentation in front of your latest client, with the boss present, and have to purchase Viagra before you can get to slide 3 ...
Would you like to download the latest Codec, before you can launch that nuke ... Actually that may be a good thing.
I have a feeling that the next upgrade to the Mac OS (White Weasel, or whatever it will be called) may be free if you agree to a lifetime subscription of Encylopedia Wikipedia, hardback version