Why shouldn’t I write about it, when it’s close to my topic, and you find it on lots of Hungarian websites?
This might be a long step towards Excel for lots…
This is a namely a blood alcohol level calculating Excel sheet.
It shows us when we are going to sober up.
Use it at your own risk!
I don’t know who is the author of it, because each version has another name (plagiarist seem to have written their own name in it), but the original file is creditable.
The idea is a strike of a genius, and the applied techniques show some possibilities of Excel.

The World's most useful excel worksheet
Besides the fact that it’s fun, I uploaded this file because of its use of form elements.
I altered it in a way that the slider, the radio button and the checkbox can be tried out in it.
The file is downloadable from here: http://www.access-excel-vba.com/mostuseful.xls
It’s not containing a macro, so it doesn’t need programming abilities, the form elements can be used without this, and although it’s spectacular, you can create it in an easy way.
Use it!
Cheerio!