I believe you will just have to sign-up somewhere saying you seen it - I would think it would be very hard to make a person have "proof" like a ticket stub.

I did something similar before with a CD/music that I purchased - but in that case, you just had to send in the UPC to "prove" you are intitled to a rebate.

We will have to wait and see. Me & my wife also went to one of those movies - which is one of the reasons I wanted to post it here - so in a few weeks, it can remind me that I should go look to see if something has been set up to file a claim - and what is needed. (Since we also have long ago thrown away our ticket stubs.)