First and foremost: If you ain't Keg Man or your name ain't on it, you should only look - and just possibly get to touch it in reverence, if you are really cute, or your very nice to Keg Man or a person whose name is on it*.
Second: If your name isn't on it, you don't get to drink out of it.
Third: The rest of the rules are on the Cup.
* In Cup speak being very nice means buying Keg Man or a Champion beers.
See Rule # 2. Keg Man's name ain't on the Cup.