Here is the situation, you are at the post office, preparing to mail your tax return. You see a man in front of you carrying his, and you notice something strange as he is preparing to put his sheets in a folder. He has one of his pages cut into thirds, one third he puts into his pocket, the other he gives to a clerk, and the other he mails off.
You go up to the man to tell him about his mistake. You argue fiercely, but learn that the page is supposed to be cut like that, at the insistence of the man and others around you.
A man at the counter allows you to borrow his scissors, but tells you that you can only cut one, straight cut, before the scissors disintegrate. You aren't allowed to tear the page that you need to cut(for the reasons of the government), nor can you borrow any sort of cutting tool or ripping tool from anyone else (you don't have any suitable device on your body either).
The tax return must be mailed off within only a few minutes if you hope to get it off in time, and your wife will be enraged with you if you go outside without having mailed it.
How can you cut the desired sheet into thirds, with only one slice by the scissors? I am not looking for a technical aspect, just something general.
P.S. I am sure you people will come up with some out of the box solutions (e.g. juggling bridge puzzle), but I am really only looking for one answer.